31110138 has 12 divisors (see below), whose sum is σ = 67405338. Its totient is φ = 10370040.

The previous prime is 31110133. The next prime is 31110151. The reversal of 31110138 is 83101113.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28869129 + 2241009 = 5373^2 + 1497^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1728341 = 31110138 / (3 + 1 + 1 + 1 + 0 + 1 + 3 + 8).

It is a self number, because there is not a number n which added to its sum of digits gives 31110138.

It is not an unprimeable number, because it can be changed into a prime (31110133) 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 5 ways as a sum of consecutive naturals, for example, 864153 + ... + 864188.

Almost surely, 2^31110138 is an apocalyptic number.

31110138 is an abundant number, since it is smaller than the sum of its proper divisors (36295200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31110138 is a wasteful number, since it uses less digits than its factorization.

31110138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728349 (or 1728346 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 31110138 is about 5577.6462777770. The cubic root of 31110138 is about 314.5096528152.

The spelling of 31110138 in words is "thirty-one million, one hundred ten thousand, one hundred thirty-eight".