57237981 has 4 divisors (see below), whose sum is σ = 76317312. Its totient is φ = 38158652.

The previous prime is 57237959. The next prime is 57237989. The reversal of 57237981 is 18973275.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57237981 - 2¹⁷ = 57106909 is a prime.

It is a super-2 number, since 2×57237981² = 6552372937912722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57237989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9539661 + ... + 9539666.

It is an arithmetic number, because the mean of its divisors is an integer number (19079328).

Almost surely, 2^57237981 is an apocalyptic number.

It is an amenable number.

57237981 is a deficient number, since it is larger than the sum of its proper divisors (19079331).

57237981 is a wasteful number, since it uses less digits than its factorization.

57237981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19079330.

The product of its digits is 105840, while the sum is 42.

The square root of 57237981 is about 7565.5786956452. The cubic root of 57237981 is about 385.3849660387.

The spelling of 57237981 in words is "fifty-seven million, two hundred thirty-seven thousand, nine hundred eighty-one".