31980556 has 12 divisors (see below), whose sum is σ = 56043792. Its totient is φ = 15968048.

The previous prime is 31980551. The next prime is 31980577. The reversal of 31980556 is 65508913.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (31980551) 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, 2080 + ... + 8263.

It is an arithmetic number, because the mean of its divisors is an integer number (4670316).

Almost surely, 2^31980556 is an apocalyptic number.

It is an amenable number.

31980556 is a deficient number, since it is larger than the sum of its proper divisors (24063236).

31980556 is a wasteful number, since it uses less digits than its factorization.

31980556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11120 (or 11118 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 31980556 is about 5655.1353653118. The cubic root of 31980556 is about 317.4158943943.

The spelling of 31980556 in words is "thirty-one million, nine hundred eighty thousand, five hundred fifty-six".