57312155 has 4 divisors (see below), whose sum is σ = 68774592. Its totient is φ = 45849720.

The previous prime is 57312139. The next prime is 57312161. The reversal of 57312155 is 55121375.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 57312155 - 2⁴ = 57312139 is a prime.

It is a super-2 number, since 2×57312155² = 6569366221488050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5731211 + ... + 5731220.

It is an arithmetic number, because the mean of its divisors is an integer number (17193648).

Almost surely, 2^57312155 is an apocalyptic number.

57312155 is a deficient number, since it is larger than the sum of its proper divisors (11462437).

57312155 is a wasteful number, since it uses less digits than its factorization.

57312155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11462436.

The product of its digits is 5250, while the sum is 29.

The square root of 57312155 is about 7570.4791790216. The cubic root of 57312155 is about 385.5513660699.

The spelling of 57312155 in words is "fifty-seven million, three hundred twelve thousand, one hundred fifty-five".