57311491 has 2 divisors, whose sum is σ = 57311492. Its totient is φ = 57311490.

The previous prime is 57311459. The next prime is 57311519. The reversal of 57311491 is 19411375.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57311491 - 2⁵ = 57311459 is a prime.

It is not a weakly prime, because it can be changed into another prime (57321491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28655745 + 28655746.

It is an arithmetic number, because the mean of its divisors is an integer number (28655746).

Almost surely, 2^57311491 is an apocalyptic number.

57311491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57311491 is an equidigital number, since it uses as much as digits as its factorization.

57311491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 57311491 is about 7570.4353243390. The cubic root of 57311491 is about 385.5498771066.

The spelling of 57311491 in words is "fifty-seven million, three hundred eleven thousand, four hundred ninety-one".