97931231 has 4 divisors (see below), whose sum is σ = 101308200. Its totient is φ = 94554264.

The previous prime is 97931213. The next prime is 97931243. The reversal of 97931231 is 13213979.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97931231 is a prime.

It is a super-2 number, since 2×97931231² = 19181052010350722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 97931191 and 97931200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97934231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688441 + ... + 1688498.

It is an arithmetic number, because the mean of its divisors is an integer number (25327050).

Almost surely, 2^97931231 is an apocalyptic number.

97931231 is a deficient number, since it is larger than the sum of its proper divisors (3376969).

97931231 is a wasteful number, since it uses less digits than its factorization.

97931231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376968.

The product of its digits is 10206, while the sum is 35.

The square root of 97931231 is about 9896.0209680457. The cubic root of 97931231 is about 460.9357621024.

The spelling of 97931231 in words is "ninety-seven million, nine hundred thirty-one thousand, two hundred thirty-one".