57148921 has 2 divisors, whose sum is σ = 57148922. Its totient is φ = 57148920.

The previous prime is 57148913. The next prime is 57148933. The reversal of 57148921 is 12984175.

57148921 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., 28676025 + 28472896 = 5355^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 57148921 - 2³ = 57148913 is a prime.

It is not a weakly prime, because it can be changed into another prime (57148901) 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, 28574460 + 28574461.

It is an arithmetic number, because the mean of its divisors is an integer number (28574461).

Almost surely, 2^57148921 is an apocalyptic number.

It is an amenable number.

57148921 is a deficient number, since it is larger than the sum of its proper divisors (1).

57148921 is an equidigital number, since it uses as much as digits as its factorization.

57148921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 57148921 is about 7559.6905359942. The cubic root of 57148921 is about 385.1849811028.

The spelling of 57148921 in words is "fifty-seven million, one hundred forty-eight thousand, nine hundred twenty-one".