31011138 has 24 divisors (see below), whose sum is σ = 67392000. Its totient is φ = 10306104.

The previous prime is 31011131. The next prime is 31011161. The reversal of 31011138 is 83111013.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31011138.

It is not an unprimeable number, because it can be changed into a prime (31011131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4063 + ... + 8861.

It is an arithmetic number, because the mean of its divisors is an integer number (2808000).

Almost surely, 2^31011138 is an apocalyptic number.

31011138 is an abundant number, since it is smaller than the sum of its proper divisors (36380862).

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

31011138 is a wasteful number, since it uses less digits than its factorization.

31011138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166 (or 5163 counting only the distinct ones).

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

The square root of 31011138 is about 5568.7644949306. The cubic root of 31011138 is about 314.1756829899.

It can be divided in two parts, 3101113 and 8, that added together give a square (3101121 = 1761²).

The spelling of 31011138 in words is "thirty-one million, eleven thousand, one hundred thirty-eight".