57131969 has 4 divisors (see below), whose sum is σ = 57197700. Its totient is φ = 57066240.

The previous prime is 57131957. The next prime is 57131981. The reversal of 57131969 is 96913175.

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

It is an interprime number because it is at equal distance from previous prime (57131957) and next prime (57131981).

It can be written as a sum of positive squares in 2 ways, for example, as 16974400 + 40157569 = 4120^2 + 6337^2 .

It is a cyclic number.

It is not a de Polignac number, because 57131969 - 2⁴ = 57131953 is a prime.

It is a super-2 number, since 2×57131969² = 6528123763633922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57131909) 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, 31544 + ... + 33305.

It is an arithmetic number, because the mean of its divisors is an integer number (14299425).

Almost surely, 2^57131969 is an apocalyptic number.

It is an amenable number.

57131969 is a deficient number, since it is larger than the sum of its proper divisors (65731).

57131969 is an equidigital number, since it uses as much as digits as its factorization.

57131969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65730.

The product of its digits is 51030, while the sum is 41.

The square root of 57131969 is about 7558.5692429189. The cubic root of 57131969 is about 385.1468917191.

The spelling of 57131969 in words is "fifty-seven million, one hundred thirty-one thousand, nine hundred sixty-nine".