31118857 has 16 divisors (see below), whose sum is σ = 41081472. Its totient is φ = 22821120.

The previous prime is 31118851. The next prime is 31118863. The reversal of 31118857 is 75881113.

It is an interprime number because it is at equal distance from previous prime (31118851) and next prime (31118863).

It is not a de Polignac number, because 31118857 - 2¹¹ = 31116809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31118851) 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 15 ways as a sum of consecutive naturals, for example, 10578 + ... + 13195.

It is an arithmetic number, because the mean of its divisors is an integer number (2567592).

Almost surely, 2^31118857 is an apocalyptic number.

It is an amenable number.

31118857 is a deficient number, since it is larger than the sum of its proper divisors (9962615).

31118857 is a wasteful number, since it uses less digits than its factorization.

31118857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23808.

The product of its digits is 6720, while the sum is 34.

The square root of 31118857 is about 5578.4278251135. The cubic root of 31118857 is about 314.5390318076.

The spelling of 31118857 in words is "thirty-one million, one hundred eighteen thousand, eight hundred fifty-seven".