31031104 has 84 divisors (see below), whose sum is σ = 70652640. Its totient is φ = 13478400.

The previous prime is 31031083. The next prime is 31031201. The reversal of 31031104 is 40113013.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205429 + ... + 205579.

Almost surely, 2^31031104 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 31031104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35326320).

31031104 is an abundant number, since it is smaller than the sum of its proper divisors (39621536).

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

31031104 is a wasteful number, since it uses less digits than its factorization.

31031104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31031104 is about 5570.5568841903. The cubic root of 31031104 is about 314.2430941025.

Adding to 31031104 its reverse (40113013), we get a palindrome (71144117).

The spelling of 31031104 in words is "thirty-one million, thirty-one thousand, one hundred four".