57711981 has 8 divisors (see below), whose sum is σ = 76991040. Its totient is φ = 38453792.

The previous prime is 57711967. The next prime is 57711989. The reversal of 57711981 is 18911775.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57711981 - 2⁹ = 57711469 is a prime.

It is a super-2 number, since 2×57711981² = 6661345501888722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57711989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3160 + ... + 11198.

It is an arithmetic number, because the mean of its divisors is an integer number (9623880).

Almost surely, 2^57711981 is an apocalyptic number.

It is an amenable number.

57711981 is a deficient number, since it is larger than the sum of its proper divisors (19279059).

57711981 is a wasteful number, since it uses less digits than its factorization.

57711981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10435.

The product of its digits is 17640, while the sum is 39.

The square root of 57711981 is about 7596.8401983983. The cubic root of 57711981 is about 386.4458614320.

The spelling of 57711981 in words is "fifty-seven million, seven hundred eleven thousand, nine hundred eighty-one".