57394721 has 2 divisors, whose sum is σ = 57394722. Its totient is φ = 57394720.

The previous prime is 57394697. The next prime is 57394751. The reversal of 57394721 is 12749375.

57394721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57214096 + 180625 = 7564^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 57394721 - 2¹⁴ = 57378337 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (57394751) 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, 28697360 + 28697361.

It is an arithmetic number, because the mean of its divisors is an integer number (28697361).

Almost surely, 2^57394721 is an apocalyptic number.

It is an amenable number.

57394721 is a deficient number, since it is larger than the sum of its proper divisors (1).

57394721 is an equidigital number, since it uses as much as digits as its factorization.

57394721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 57394721 is about 7575.9303719081. The cubic root of 57394721 is about 385.7364237277.

The spelling of 57394721 in words is "fifty-seven million, three hundred ninety-four thousand, seven hundred twenty-one".