57531631 has 4 divisors (see below), whose sum is σ = 57646512. Its totient is φ = 57416752.

The previous prime is 57531623. The next prime is 57531637. The reversal of 57531631 is 13613575.

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

It is a cyclic number.

It is not a de Polignac number, because 57531631 - 2³ = 57531623 is a prime.

It is a super-2 number, since 2×57531631² = 6619777131040322, 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 junction number, because it is equal to n+sod(n) for n = 57531593 and 57531602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57531637) 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, 56686 + ... + 57691.

It is an arithmetic number, because the mean of its divisors is an integer number (14411628).

Almost surely, 2^57531631 is an apocalyptic number.

57531631 is a deficient number, since it is larger than the sum of its proper divisors (114881).

57531631 is a wasteful number, since it uses less digits than its factorization.

57531631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114880.

The product of its digits is 9450, while the sum is 31.

The square root of 57531631 is about 7584.9608436695. The cubic root of 57531631 is about 386.0428934767.

The spelling of 57531631 in words is "fifty-seven million, five hundred thirty-one thousand, six hundred thirty-one".