57156493 has 2 divisors, whose sum is σ = 57156494. Its totient is φ = 57156492.

The previous prime is 57156413. The next prime is 57156497. The reversal of 57156493 is 39465175.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45198729 + 11957764 = 6723^2 + 3458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57156493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57156497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28578246 + 28578247.

It is an arithmetic number, because the mean of its divisors is an integer number (28578247).

Almost surely, 2^57156493 is an apocalyptic number.

It is an amenable number.

57156493 is a deficient number, since it is larger than the sum of its proper divisors (1).

57156493 is an equidigital number, since it uses as much as digits as its factorization.

57156493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 40.

The square root of 57156493 is about 7560.1913335576. The cubic root of 57156493 is about 385.2019921668.

The spelling of 57156493 in words is "fifty-seven million, one hundred fifty-six thousand, four hundred ninety-three".