The mnemonic phrase is sa ri gi mi pa dhi nu.
[1] Its ārohaṇa-avarohaṇa structure (ascending and descending scale) is as follows (see swaras in Carnatic music for details on below notation and terms): (the notes in this scale are chathusruthi rishabham, sadharana gandharam, prati madhyamam, chathusruthi dhaivatham, kakali nishadham) As it is a melakarta rāgam, by definition it is a sampoorna rāgam (has all seven notes in ascending and descending scale).
Dharmavati has a few janya rāgams (derived scales) associated with it, of which Madhuvanti, Ranjani, Sri Tyagaraja and Vijayanagari are popular in concerts.
Ilaiyaraja composed songs such as 'Meendum Meedum Vaa' (Vikram), 'Andhela Ravamidhi', (Swarna Kamalam), 'Vaanaville' (Ramana), 'Nataraaja paadaalu' (Aalaapana) in this raaga while Rahman composed "Ottagathai Kattiko", in the 1993 Tamil film Gentleman, based on the Dharmavati scale.
Dharmavati's notes when shifted using Graha bhedam, yields 2 other Melakarta rāgams, namely, Chakravakam and Sarasangi.