31120656 has 80 divisors (see below), whose sum is σ = 95898624. Its totient is φ = 8502912.

The previous prime is 31120631. The next prime is 31120657. The reversal of 31120656 is 65602113.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (31120657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5715 + ... + 9741.

Almost surely, 2^31120656 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 31120656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47949312).

31120656 is an abundant number, since it is smaller than the sum of its proper divisors (64777968).

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

31120656 is a wasteful number, since it uses less digits than its factorization.

31120656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068 (or 4062 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 31120656 is about 5578.5890689313. The cubic root of 31120656 is about 314.5450929215.

Adding to 31120656 its reverse (65602113), we get a palindrome (96722769).

The spelling of 31120656 in words is "thirty-one million, one hundred twenty thousand, six hundred fifty-six".