31291113 has 16 divisors (see below), whose sum is σ = 48157056. Its totient is φ = 17702400.

The previous prime is 31291111. The next prime is 31291123. The reversal of 31291113 is 31119213.

It is not a de Polignac number, because 31291113 - 2¹ = 31291111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 31291113.

It is not an unprimeable number, because it can be changed into a prime (31291111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5256 + ... + 9497.

It is an arithmetic number, because the mean of its divisors is an integer number (3009816).

Almost surely, 2^31291113 is an apocalyptic number.

It is an amenable number.

31291113 is a deficient number, since it is larger than the sum of its proper divisors (16865943).

31291113 is a wasteful number, since it uses less digits than its factorization.

31291113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14864.

The product of its digits is 162, while the sum is 21.

The square root of 31291113 is about 5593.8459935897. The cubic root of 31291113 is about 315.1183329665.

The spelling of 31291113 in words is "thirty-one million, two hundred ninety-one thousand, one hundred thirteen".