57311913 has 16 divisors (see below), whose sum is σ = 81120960. Its totient is φ = 35867136.

The previous prime is 57311911. The next prime is 57311939. The reversal of 57311913 is 31911375.

It is a happy number.

It is not a de Polignac number, because 57311913 - 2¹ = 57311911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57311911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22078 + ... + 24536.

It is an arithmetic number, because the mean of its divisors is an integer number (5070060).

Almost surely, 2^57311913 is an apocalyptic number.

It is an amenable number.

57311913 is a deficient number, since it is larger than the sum of its proper divisors (23809047).

57311913 is a wasteful number, since it uses less digits than its factorization.

57311913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936.

The product of its digits is 2835, while the sum is 30.

The square root of 57311913 is about 7570.4631958685. The cubic root of 57311913 is about 385.5508234069.

It can be divided in two parts, 573119 and 13, that multiplied together give a palindrome (7450547).

The spelling of 57311913 in words is "fifty-seven million, three hundred eleven thousand, nine hundred thirteen".