57181913 has 2 divisors, whose sum is σ = 57181914. Its totient is φ = 57181912.

The previous prime is 57181871. The next prime is 57181961. The reversal of 57181913 is 31918175.

57181913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38837824 + 18344089 = 6232^2 + 4283^2 .

It is a cyclic number.

It is not a de Polignac number, because 57181913 - 2¹⁴ = 57165529 is a prime.

It is not a weakly prime, because it can be changed into another prime (57181973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28590956 + 28590957.

It is an arithmetic number, because the mean of its divisors is an integer number (28590957).

Almost surely, 2^57181913 is an apocalyptic number.

It is an amenable number.

57181913 is a deficient number, since it is larger than the sum of its proper divisors (1).

57181913 is an equidigital number, since it uses as much as digits as its factorization.

57181913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 35.

The square root of 57181913 is about 7561.8723210591. The cubic root of 57181913 is about 385.2590891117.

The spelling of 57181913 in words is "fifty-seven million, one hundred eighty-one thousand, nine hundred thirteen".