57131961 has 4 divisors (see below), whose sum is σ = 76175952. Its totient is φ = 38087972.

The previous prime is 57131957. The next prime is 57131981. The reversal of 57131961 is 16913175.

It is a happy number.

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 not a de Polignac number, because 57131961 - 2² = 57131957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57131981) 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, 9521991 + ... + 9521996.

It is an arithmetic number, because the mean of its divisors is an integer number (19043988).

Almost surely, 2^57131961 is an apocalyptic number.

It is an amenable number.

57131961 is a deficient number, since it is larger than the sum of its proper divisors (19043991).

57131961 is a wasteful number, since it uses less digits than its factorization.

57131961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19043990.

The product of its digits is 5670, while the sum is 33.

The square root of 57131961 is about 7558.5687137182. The cubic root of 57131961 is about 385.1468737422.

The spelling of 57131961 in words is "fifty-seven million, one hundred thirty-one thousand, nine hundred sixty-one".