57312213 has 16 divisors (see below), whose sum is σ = 89116800. Its totient is φ = 32749248.

The previous prime is 57312197. The next prime is 57312221. The reversal of 57312213 is 31221375.

It is not a de Polignac number, because 57312213 - 2⁴ = 57312197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57313213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26820 + ... + 28877.

It is an arithmetic number, because the mean of its divisors is an integer number (5569800).

Almost surely, 2^57312213 is an apocalyptic number.

It is an amenable number.

57312213 is a deficient number, since it is larger than the sum of its proper divisors (31804587).

57312213 is an equidigital number, since it uses as much as digits as its factorization.

57312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55721 (or 55707 counting only the distinct ones).

The product of its digits is 1260, while the sum is 24.

The square root of 57312213 is about 7570.4830096897. The cubic root of 57312213 is about 385.5514961294.

Adding to 57312213 its reverse (31221375), we get a palindrome (88533588).

The spelling of 57312213 in words is "fifty-seven million, three hundred twelve thousand, two hundred thirteen".