57731917 has 2 divisors, whose sum is σ = 57731918. Its totient is φ = 57731916.

The previous prime is 57731887. The next prime is 57731923. The reversal of 57731917 is 71913775.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43375396 + 14356521 = 6586^2 + 3789^2 .

It is a cyclic number.

It is not a de Polignac number, because 57731917 - 2⁷ = 57731789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57731917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57731017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28865958 + 28865959.

It is an arithmetic number, because the mean of its divisors is an integer number (28865959).

Almost surely, 2^57731917 is an apocalyptic number.

It is an amenable number.

57731917 is a deficient number, since it is larger than the sum of its proper divisors (1).

57731917 is an equidigital number, since it uses as much as digits as its factorization.

57731917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46305, while the sum is 40.

The square root of 57731917 is about 7598.1522095836. The cubic root of 57731917 is about 386.4903542023.

The spelling of 57731917 in words is "fifty-seven million, seven hundred thirty-one thousand, nine hundred seventeen".