57121131 has 4 divisors (see below), whose sum is σ = 76161512. Its totient is φ = 38080752.

The previous prime is 57121111. The next prime is 57121151. The reversal of 57121131 is 13112175.

It is a happy number.

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 (57121111) and next prime (57121151).

It is not a de Polignac number, because 57121131 - 2²¹ = 55023979 is a prime.

It is a super-2 number, since 2×57121131² = 6525647213438322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 57121098 and 57121107.

It is not an unprimeable number, because it can be changed into a prime (57121111) 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, 9520186 + ... + 9520191.

It is an arithmetic number, because the mean of its divisors is an integer number (19040378).

Almost surely, 2^57121131 is an apocalyptic number.

57121131 is a deficient number, since it is larger than the sum of its proper divisors (19040381).

57121131 is a wasteful number, since it uses less digits than its factorization.

57121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19040380.

The product of its digits is 210, while the sum is 21.

The square root of 57121131 is about 7557.8522742906. The cubic root of 57121131 is about 385.1225359100.

The spelling of 57121131 in words is "fifty-seven million, one hundred twenty-one thousand, one hundred thirty-one".