57131311 has 4 divisors (see below), whose sum is σ = 57147552. Its totient is φ = 57115072.

The previous prime is 57131279. The next prime is 57131341. The reversal of 57131311 is 11313175.

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 57131311 - 2⁵ = 57131279 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 (57131341) 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, 391 + ... + 10696.

It is an arithmetic number, because the mean of its divisors is an integer number (14286888).

Almost surely, 2^57131311 is an apocalyptic number.

57131311 is a deficient number, since it is larger than the sum of its proper divisors (16241).

57131311 is a wasteful number, since it uses less digits than its factorization.

57131311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16240.

The product of its digits is 315, while the sum is 22.

The square root of 57131311 is about 7558.5257160375. The cubic root of 57131311 is about 385.1454131095.

Adding to 57131311 its reverse (11313175), we get a palindrome (68444486).

The spelling of 57131311 in words is "fifty-seven million, one hundred thirty-one thousand, three hundred eleven".