57490921 has 2 divisors, whose sum is σ = 57490922. Its totient is φ = 57490920.

The previous prime is 57490913. The next prime is 57490943. The reversal of 57490921 is 12909475.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50410000 + 7080921 = 7100^2 + 2661^2 .

It is a cyclic number.

It is not a de Polignac number, because 57490921 - 2³ = 57490913 is a prime.

It is not a weakly prime, because it can be changed into another prime (57490021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28745460 + 28745461.

It is an arithmetic number, because the mean of its divisors is an integer number (28745461).

Almost surely, 2^57490921 is an apocalyptic number.

It is an amenable number.

57490921 is a deficient number, since it is larger than the sum of its proper divisors (1).

57490921 is an equidigital number, since it uses as much as digits as its factorization.

57490921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 57490921 is about 7582.2767688868. The cubic root of 57490921 is about 385.9518159583.

The spelling of 57490921 in words is "fifty-seven million, four hundred ninety thousand, nine hundred twenty-one".