Multipling 96721 by its sum of digits (25), we get a square (2418025 = 15552).
Multipling 96721 by its reverse (12769), we get a square (1235030449 = 351432).
The square root of 96721 is 311.
96721 is nontrivially palindromic in base 15.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12769 = 1132.
It is a de Polignac number, because none of the positive numbers 2k-96721 is a prime.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
296721 is an apocalyptic number.
96721 is the 311-st square number.
96721 is the 156-th centered octagonal number.
It is an amenable number.
96721 is an frugal number, since it uses more digits than its factorization.
96721 is an evil number, because the sum of its binary digits is even.
The cubic root of 96721 is about 45.9029143318.
The spelling of 96721 in words is "ninety-six thousand, seven hundred twenty-one".