57137909 has 4 divisors (see below), whose sum is σ = 57662220. Its totient is φ = 56613600.

The previous prime is 57137897. The next prime is 57137923. The reversal of 57137909 is 90973175.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52200625 + 4937284 = 7225^2 + 2222^2 .

It is a cyclic number.

It is not a de Polignac number, because 57137909 - 2⁸ = 57137653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57137939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261992 + ... + 262209.

It is an arithmetic number, because the mean of its divisors is an integer number (14415555).

Almost surely, 2^57137909 is an apocalyptic number.

It is an amenable number.

57137909 is a deficient number, since it is larger than the sum of its proper divisors (524311).

57137909 is a wasteful number, since it uses less digits than its factorization.

57137909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524310.

The product of its (nonzero) digits is 59535, while the sum is 41.

The square root of 57137909 is about 7558.9621642128. The cubic root of 57137909 is about 385.1602391397.

The spelling of 57137909 in words is "fifty-seven million, one hundred thirty-seven thousand, nine hundred nine".