31631104 has 36 divisors (see below), whose sum is σ = 63621544. Its totient is φ = 15694848.

The previous prime is 31631087. The next prime is 31631107. The reversal of 31631104 is 40113613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31631107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39799 + ... + 40585.

Almost surely, 2^31631104 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 31631104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31810772).

31631104 is an abundant number, since it is smaller than the sum of its proper divisors (31990440).

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

31631104 is an equidigital number, since it uses as much as digits as its factorization.

31631104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 31631104 is about 5624.1536252133. The cubic root of 31631104 is about 316.2555215750.

Adding to 31631104 its reverse (40113613), we get a palindrome (71744717).

The spelling of 31631104 in words is "thirty-one million, six hundred thirty-one thousand, one hundred four".