57724981 has 2 divisors, whose sum is σ = 57724982. Its totient is φ = 57724980.

The previous prime is 57724973. The next prime is 57725023. The reversal of 57724981 is 18942775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45684081 + 12040900 = 6759^2 + 3470^2 .

It is a cyclic number.

It is not a de Polignac number, because 57724981 - 2³ = 57724973 is a prime.

It is a super-2 number, since 2×57724981² = 6664346862900722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57724081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28862490 + 28862491.

It is an arithmetic number, because the mean of its divisors is an integer number (28862491).

Almost surely, 2^57724981 is an apocalyptic number.

It is an amenable number.

57724981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57724981 is an equidigital number, since it uses as much as digits as its factorization.

57724981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 43.

The square root of 57724981 is about 7597.6957691132. The cubic root of 57724981 is about 386.4748757368.

The spelling of 57724981 in words is "fifty-seven million, seven hundred twenty-four thousand, nine hundred eighty-one".