The record for mentally calculating and writing the cube roots of maximum 9-digit numbers in one minute was set by Vismay M. Thayappa (born on March 24, 2012) of Bengaluru, Karnataka. He mentally calculated and wrote the cube roots of 30 nine-digit numbers in one minute (under the guidance of VMAT Academy, Bengaluru), using a pen, at the age of 14 years and 20 days, as confirmed on April 13, 2026.
