57122981 has 2 divisors, whose sum is σ = 57122982. Its totient is φ = 57122980.

The previous prime is 57122951. The next prime is 57122993. The reversal of 57122981 is 18922175.

57122981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35880100 + 21242881 = 5990^2 + 4609^2 .

It is a cyclic number.

It is not a de Polignac number, because 57122981 - 2⁶ = 57122917 is a prime.

It is a super-2 number, since 2×57122981² = 6526069916652722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57122951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28561490 + 28561491.

It is an arithmetic number, because the mean of its divisors is an integer number (28561491).

Almost surely, 2^57122981 is an apocalyptic number.

It is an amenable number.

57122981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57122981 is an equidigital number, since it uses as much as digits as its factorization.

57122981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 57122981 is about 7557.9746625667. The cubic root of 57122981 is about 385.1266935599.

The spelling of 57122981 in words is "fifty-seven million, one hundred twenty-two thousand, nine hundred eighty-one".