57731621 has 2 divisors, whose sum is σ = 57731622. Its totient is φ = 57731620.

The previous prime is 57731599. The next prime is 57731627. The reversal of 57731621 is 12613775.

57731621 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., 56325025 + 1406596 = 7505^2 + 1186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57731621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57731627) 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, 28865810 + 28865811.

It is an arithmetic number, because the mean of its divisors is an integer number (28865811).

Almost surely, 2^57731621 is an apocalyptic number.

It is an amenable number.

57731621 is a deficient number, since it is larger than the sum of its proper divisors (1).

57731621 is an equidigital number, since it uses as much as digits as its factorization.

57731621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 32.

The square root of 57731621 is about 7598.1327311386. The cubic root of 57731621 is about 386.4896936703.

The spelling of 57731621 in words is "fifty-seven million, seven hundred thirty-one thousand, six hundred twenty-one".