57216051 has 24 divisors (see below), whose sum is σ = 86150064. Its totient is φ = 37946880.

The previous prime is 57216007. The next prime is 57216059. The reversal of 57216051 is 15061275.

57216051 is a `hidden beast` number, since 57 + 2 + 1 + 605 + 1 = 666.

It is not a de Polignac number, because 57216051 - 2⁹ = 57215539 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (57216059) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58075 + ... + 59051.

It is an arithmetic number, because the mean of its divisors is an integer number (3589586).

Almost surely, 2^57216051 is an apocalyptic number.

57216051 is a deficient number, since it is larger than the sum of its proper divisors (28934013).

57216051 is an equidigital number, since it uses as much as digits as its factorization.

57216051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1233 (or 1221 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 57216051 is about 7564.1292294619. The cubic root of 57216051 is about 385.3357413122.

The spelling of 57216051 in words is "fifty-seven million, two hundred sixteen thousand, fifty-one".