CAN WE CONVERT FIGURES INTO WRITTEN WORDS IN TABLEAU LIKE 250 IS CONVERT TO TWO HUNDRED FIFTY ONLY

Agree with @Hideaki Shiihara​ that it would be cumbersome to do in Tableau directly.

Another option would be to use VBA with MS-Excel to create a reference table in advance of bringing the results into Tableau, then join the reference table to your data (or use your own/real data with it). Two VBA options noted below, both referencing similar approaches in MS-Excel:

Convert Number to Words in Excel:  excelx.com

Two best ways to convert numbers to words in Excel:  ablebits.com