231042757 has 4 divisors (see below), whose sum is σ = 252046656. Its totient is φ = 210038860.

The previous prime is 231042709. The next prime is 231042769. The reversal of 231042757 is 757240132.

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 cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231042757 is a prime.

It is a super-2 number, since 2×231042757² = 106761511124322098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231042787) 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, 10501933 + ... + 10501954.

It is an arithmetic number, because the mean of its divisors is an integer number (63011664).

Almost surely, 2^231042757 is an apocalyptic number.

It is an amenable number.

231042757 is a deficient number, since it is larger than the sum of its proper divisors (21003899).

231042757 is a wasteful number, since it uses less digits than its factorization.

231042757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21003898.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 231042757 is about 15200.0906905189. The cubic root of 231042757 is about 613.6170984961.

Adding to 231042757 its reverse (757240132), we get a palindrome (988282889).

The spelling of 231042757 in words is "two hundred thirty-one million, forty-two thousand, seven hundred fifty-seven".