57000991 has 2 divisors, whose sum is σ = 57000992. Its totient is φ = 57000990.

The previous prime is 57000967. The next prime is 57001003. The reversal of 57000991 is 19900075.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57000991 - 2⁵ = 57000959 is a prime.

It is a super-2 number, since 2×57000991² = 6498225949964162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57000961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28500495 + 28500496.

It is an arithmetic number, because the mean of its divisors is an integer number (28500496).

Almost surely, 2^57000991 is an apocalyptic number.

57000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

57000991 is an equidigital number, since it uses as much as digits as its factorization.

57000991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2835, while the sum is 31.

The square root of 57000991 is about 7549.9000655638. The cubic root of 57000991 is about 384.8523434449.

The spelling of 57000991 in words is "fifty-seven million, nine hundred ninety-one", and thus it is an aban number.