97691431 has 4 divisors (see below), whose sum is σ = 97711200. Its totient is φ = 97671664.

The previous prime is 97691423. The next prime is 97691437. The reversal of 97691431 is 13419679.

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.

It is a cyclic number.

It is not a de Polignac number, because 97691431 - 2³ = 97691423 is a prime.

It is a super-2 number, since 2×97691431² = 19087231381655522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97691437) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4875 + ... + 14803.

It is an arithmetic number, because the mean of its divisors is an integer number (24427800).

Almost surely, 2^97691431 is an apocalyptic number.

97691431 is a deficient number, since it is larger than the sum of its proper divisors (19769).

97691431 is an equidigital number, since it uses as much as digits as its factorization.

97691431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19768.

The product of its digits is 40824, while the sum is 40.

The square root of 97691431 is about 9883.8975611851. The cubic root of 97691431 is about 460.5592300666.

The spelling of 97691431 in words is "ninety-seven million, six hundred ninety-one thousand, four hundred thirty-one".