57391971 has 32 divisors (see below), whose sum is σ = 96391680. Its totient is φ = 29562624.

The previous prime is 57391897. The next prime is 57391973. The reversal of 57391971 is 17919375.

57391971 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 57391971 - 2⁷ = 57391843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57391973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9295 + ... + 14183.

It is an arithmetic number, because the mean of its divisors is an integer number (3012240).

Almost surely, 2^57391971 is an apocalyptic number.

57391971 is a deficient number, since it is larger than the sum of its proper divisors (38999709).

57391971 is a wasteful number, since it uses less digits than its factorization.

57391971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4955.

The product of its digits is 59535, while the sum is 42.

The square root of 57391971 is about 7575.7488738738. The cubic root of 57391971 is about 385.7302629282.

The spelling of 57391971 in words is "fifty-seven million, three hundred ninety-one thousand, nine hundred seventy-one".