31530996 has 72 divisors (see below), whose sum is σ = 91675584. Its totient is φ = 8951040.

The previous prime is 31530979. The next prime is 31531001. The reversal of 31530996 is 69903513.

31530996 is a `hidden beast` number, since 31 + 530 + 9 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 31530996.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52876 + ... + 53468.

It is an arithmetic number, because the mean of its divisors is an integer number (1273272).

Almost surely, 2^31530996 is an apocalyptic number.

31530996 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31530996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45837792).

31530996 is an abundant number, since it is smaller than the sum of its proper divisors (60144588).

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

31530996 is a wasteful number, since it uses less digits than its factorization.

31530996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 36.

The square root of 31530996 is about 5615.2467443559. The cubic root of 31530996 is about 315.9215342218.

The spelling of 31530996 in words is "thirty-one million, five hundred thirty thousand, nine hundred ninety-six".