231772457 has 4 divisors (see below), whose sum is σ = 264882816. Its totient is φ = 198662100.

The previous prime is 231772447. The next prime is 231772481. The reversal of 231772457 is 754277132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-231772457 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231772457.

It is not an unprimeable number, because it can be changed into a prime (231772427) 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, 16555169 + ... + 16555182.

It is an arithmetic number, because the mean of its divisors is an integer number (66220704).

Almost surely, 2^231772457 is an apocalyptic number.

It is an amenable number.

231772457 is a deficient number, since it is larger than the sum of its proper divisors (33110359).

231772457 is an equidigital number, since it uses as much as digits as its factorization.

231772457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33110358.

The product of its digits is 82320, while the sum is 38.

The square root of 231772457 is about 15224.0749144242. The cubic root of 231772457 is about 614.2624131649.

The spelling of 231772457 in words is "two hundred thirty-one million, seven hundred seventy-two thousand, four hundred fifty-seven".