57187091 has 4 divisors (see below), whose sum is σ = 61586112. Its totient is φ = 52788072.

The previous prime is 57187057. The next prime is 57187111. The reversal of 57187091 is 19078175.

57187091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 57187091 - 2⁶ = 57187027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57187001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2199491 + ... + 2199516.

It is an arithmetic number, because the mean of its divisors is an integer number (15396528).

Almost surely, 2^57187091 is an apocalyptic number.

57187091 is a deficient number, since it is larger than the sum of its proper divisors (4399021).

57187091 is a wasteful number, since it uses less digits than its factorization.

57187091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4399020.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 57187091 is about 7562.2146888329. The cubic root of 57187091 is about 385.2707175634.

The spelling of 57187091 in words is "fifty-seven million, one hundred eighty-seven thousand, ninety-one".