31391104 has 32 divisors (see below), whose sum is σ = 63170640. Its totient is φ = 15536640.

The previous prime is 31391099. The next prime is 31391119. The reversal of 31391104 is 40119313.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11994 + ... + 14374.

Almost surely, 2^31391104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31391104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31585320).

31391104 is an abundant number, since it is smaller than the sum of its proper divisors (31779536).

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

31391104 is a wasteful number, since it uses less digits than its factorization.

31391104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2498 (or 2486 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 31391104 is about 5602.7764545804. The cubic root of 31391104 is about 315.4536304493.

The spelling of 31391104 in words is "thirty-one million, three hundred ninety-one thousand, one hundred four".