57813921 has 18 divisors (see below), whose sum is σ = 91792610. Its totient is φ = 35038080.

The previous prime is 57813871. The next prime is 57813953. The reversal of 57813921 is 12931875.

57813921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 36469521 + 21344400 = 6039^2 + 4620^2 .

It is not a de Polignac number, because 57813921 - 2¹⁹ = 57289633 is a prime.

It is a super-2 number, since 2×57813921² = 6684898922788482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57813961) 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 in 17 ways as a sum of consecutive naturals, for example, 25456 + ... + 27633.

Almost surely, 2^57813921 is an apocalyptic number.

It is an amenable number.

57813921 is a deficient number, since it is larger than the sum of its proper divisors (33978689).

57813921 is a wasteful number, since it uses less digits than its factorization.

57813921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53117 (or 53103 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 57813921 is about 7603.5466066830. The cubic root of 57813921 is about 386.6732614643.

The spelling of 57813921 in words is "fifty-seven million, eight hundred thirteen thousand, nine hundred twenty-one".