57138233 has 4 divisors (see below), whose sum is σ = 59622528. Its totient is φ = 54653940.

The previous prime is 57138227. The next prime is 57138269. The reversal of 57138233 is 33283175.

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 not a de Polignac number, because 57138233 - 2⁴ = 57138217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57138233.

It is not an unprimeable number, because it can be changed into a prime (57338233) 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, 1242113 + ... + 1242158.

It is an arithmetic number, because the mean of its divisors is an integer number (14905632).

Almost surely, 2^57138233 is an apocalyptic number.

It is an amenable number.

57138233 is a deficient number, since it is larger than the sum of its proper divisors (2484295).

57138233 is a wasteful number, since it uses less digits than its factorization.

57138233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484294.

The product of its digits is 15120, while the sum is 32.

The square root of 57138233 is about 7558.9835956959. The cubic root of 57138233 is about 385.1609671542.

The spelling of 57138233 in words is "fifty-seven million, one hundred thirty-eight thousand, two hundred thirty-three".