31321108 has 36 divisors (see below), whose sum is σ = 67841760. Its totient is φ = 12388896.

The previous prime is 31321057. The next prime is 31321109. The reversal of 31321108 is 80112313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321109) 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, 1423 + ... + 8041.

Almost surely, 2^31321108 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 31321108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33920880).

31321108 is an abundant number, since it is smaller than the sum of its proper divisors (36520652).

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

31321108 is a wasteful number, since it uses less digits than its factorization.

31321108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6656 (or 6641 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 31321108 is about 5596.5264227019. The cubic root of 31321108 is about 315.2189894037.

The spelling of 31321108 in words is "thirty-one million, three hundred twenty-one thousand, one hundred eight".