31113918 has 24 divisors (see below), whose sum is σ = 73542456. Its totient is φ = 9428400.

The previous prime is 31113911. The next prime is 31113923. The reversal of 31113918 is 81931113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31113891 and 31113900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78373 + ... + 78768.

It is an arithmetic number, because the mean of its divisors is an integer number (3064269).

Almost surely, 2^31113918 is an apocalyptic number.

31113918 is an abundant number, since it is smaller than the sum of its proper divisors (42428538).

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

31113918 is a wasteful number, since it uses less digits than its factorization.

31113918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157160 (or 157157 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 31113918 is about 5577.9851200949. The cubic root of 31113918 is about 314.5223903387.

The spelling of 31113918 in words is "thirty-one million, one hundred thirteen thousand, nine hundred eighteen".