231536057 has 4 divisors (see below), whose sum is σ = 231617316. Its totient is φ = 231454800.

The previous prime is 231536051. The next prime is 231536083. The reversal of 231536057 is 750635132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31483321 + 200052736 = 5611^2 + 14144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231536057 is a prime.

It is a super-2 number, since 2×231536057² = 107217891382214498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231536051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36194 + ... + 42107.

It is an arithmetic number, because the mean of its divisors is an integer number (57904329).

Almost surely, 2^231536057 is an apocalyptic number.

It is an amenable number.

231536057 is a deficient number, since it is larger than the sum of its proper divisors (81259).

231536057 is an equidigital number, since it uses as much as digits as its factorization.

231536057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81258.

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 231536057 is about 15216.3089151082. The cubic root of 231536057 is about 614.0534998847.

The spelling of 231536057 in words is "two hundred thirty-one million, five hundred thirty-six thousand, fifty-seven".