57212813 has 8 divisors (see below), whose sum is σ = 66174528. Its totient is φ = 48448224.

The previous prime is 57212797. The next prime is 57212821. The reversal of 57212813 is 31821275.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 57212813 - 2⁴ = 57212797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57212863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48656 + ... + 49817.

It is an arithmetic number, because the mean of its divisors is an integer number (8271816).

Almost surely, 2^57212813 is an apocalyptic number.

It is an amenable number.

57212813 is a deficient number, since it is larger than the sum of its proper divisors (8961715).

57212813 is an equidigital number, since it uses as much as digits as its factorization.

57212813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98563.

The product of its digits is 3360, while the sum is 29.

The square root of 57212813 is about 7563.9151899000. The cubic root of 57212813 is about 385.3284721360.

The spelling of 57212813 in words is "fifty-seven million, two hundred twelve thousand, eight hundred thirteen".