57122991 has 6 divisors (see below), whose sum is σ = 82511000. Its totient is φ = 38081988.

The previous prime is 57122981. The next prime is 57122993. The reversal of 57122991 is 19922175.

It is not a de Polignac number, because 57122991 - 2¹⁴ = 57106607 is a prime.

It is a super-2 number, since 2×57122991² = 6526072201572162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57122993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3173491 + ... + 3173508.

Almost surely, 2^57122991 is an apocalyptic number.

57122991 is a deficient number, since it is larger than the sum of its proper divisors (25388009).

57122991 is a wasteful number, since it uses less digits than its factorization.

57122991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6347005 (or 6347002 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 57122991 is about 7557.9753241195. The cubic root of 57122991 is about 385.1267160335.

The spelling of 57122991 in words is "fifty-seven million, one hundred twenty-two thousand, nine hundred ninety-one".