31090104 has 24 divisors (see below), whose sum is σ = 84202560. Its totient is φ = 10363344.

The previous prime is 31090091. The next prime is 31090133. The reversal of 31090104 is 40109013.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215832 + ... + 215975.

It is an arithmetic number, because the mean of its divisors is an integer number (3508440).

Almost surely, 2^31090104 is an apocalyptic number.

It is an amenable number.

31090104 is an abundant number, since it is smaller than the sum of its proper divisors (53112456).

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

31090104 is a wasteful number, since it uses less digits than its factorization.

31090104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431819 (or 431812 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 31090104 is about 5575.8500697203. The cubic root of 31090104 is about 314.4421267095.

Adding to 31090104 its reverse (40109013), we get a palindrome (71199117).

The spelling of 31090104 in words is "thirty-one million, ninety thousand, one hundred four".