57731561 has 2 divisors, whose sum is σ = 57731562. Its totient is φ = 57731560.

The previous prime is 57731551. The next prime is 57731593. The reversal of 57731561 is 16513775.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45697600 + 12033961 = 6760^2 + 3469^2 .

It is a cyclic number.

It is not a de Polignac number, because 57731561 - 2¹⁰ = 57730537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57731501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28865780 + 28865781.

It is an arithmetic number, because the mean of its divisors is an integer number (28865781).

Almost surely, 2^57731561 is an apocalyptic number.

It is an amenable number.

57731561 is a deficient number, since it is larger than the sum of its proper divisors (1).

57731561 is an equidigital number, since it uses as much as digits as its factorization.

57731561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 35.

The square root of 57731561 is about 7598.1287827991. The cubic root of 57731561 is about 386.4895597784.

The spelling of 57731561 in words is "fifty-seven million, seven hundred thirty-one thousand, five hundred sixty-one".