231057531 has 12 divisors (see below), whose sum is σ = 336991408. Its totient is φ = 152542224.

The previous prime is 231057503. The next prime is 231057551. The reversal of 231057531 is 135750132.

231057531 is a `hidden beast` number, since 23 + 105 + 7 + 531 = 666.

It is not a de Polignac number, because 231057531 - 2⁶ = 231057467 is a prime.

It is a super-2 number, since 2×231057531² = 106775165263631922, 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 = 231057495 and 231057504.

It is not an unprimeable number, because it can be changed into a prime (231057551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123700 + ... + 125553.

Almost surely, 2^231057531 is an apocalyptic number.

231057531 is a deficient number, since it is larger than the sum of its proper divisors (105933877).

231057531 is a wasteful number, since it uses less digits than its factorization.

231057531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249362 (or 249359 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 231057531 is about 15200.5766666926. The cubic root of 231057531 is about 613.6301774401.

The spelling of 231057531 in words is "two hundred thirty-one million, fifty-seven thousand, five hundred thirty-one".