97921431 has 6 divisors (see below), whose sum is σ = 141442080. Its totient is φ = 65280948.

The previous prime is 97921423. The next prime is 97921441. The reversal of 97921431 is 13412979.

It is not a de Polignac number, because 97921431 - 2³ = 97921423 is a prime.

It is a super-2 number, since 2×97921431² = 19177213298175522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97921441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5440071 + ... + 5440088.

It is an arithmetic number, because the mean of its divisors is an integer number (23573680).

Almost surely, 2^97921431 is an apocalyptic number.

97921431 is a deficient number, since it is larger than the sum of its proper divisors (43520649).

97921431 is a wasteful number, since it uses less digits than its factorization.

97921431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10880165 (or 10880162 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 97921431 is about 9895.5258071514. The cubic root of 97921431 is about 460.9203862749.

The spelling of 97921431 in words is "ninety-seven million, nine hundred twenty-one thousand, four hundred thirty-one".