57113921 has 4 divisors (see below), whose sum is σ = 57173952. Its totient is φ = 57053892.

The previous prime is 57113909. The next prime is 57113923. The reversal of 57113921 is 12931175.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57113921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57113923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28565 + ... + 30498.

It is an arithmetic number, because the mean of its divisors is an integer number (14293488).

Almost surely, 2^57113921 is an apocalyptic number.

It is an amenable number.

57113921 is a deficient number, since it is larger than the sum of its proper divisors (60031).

57113921 is an equidigital number, since it uses as much as digits as its factorization.

57113921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60030.

The product of its digits is 1890, while the sum is 29.

The square root of 57113921 is about 7557.3752718785. The cubic root of 57113921 is about 385.1063314554.

The spelling of 57113921 in words is "fifty-seven million, one hundred thirteen thousand, nine hundred twenty-one".