57239213 has 4 divisors (see below), whose sum is σ = 57963840. Its totient is φ = 56514588.

The previous prime is 57239209. The next prime is 57239219. The reversal of 57239213 is 31293275.

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 57239213 - 2² = 57239209 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 57239213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57239219) 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, 362195 + ... + 362352.

It is an arithmetic number, because the mean of its divisors is an integer number (14490960).

Almost surely, 2^57239213 is an apocalyptic number.

It is an amenable number.

57239213 is a deficient number, since it is larger than the sum of its proper divisors (724627).

57239213 is an equidigital number, since it uses as much as digits as its factorization.

57239213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724626.

The product of its digits is 11340, while the sum is 32.

The square root of 57239213 is about 7565.6601166058. The cubic root of 57239213 is about 385.3877310493.

The spelling of 57239213 in words is "fifty-seven million, two hundred thirty-nine thousand, two hundred thirteen".