31988612 has 6 divisors (see below), whose sum is σ = 55980078. Its totient is φ = 15994304.

The previous prime is 31988599. The next prime is 31988639. The reversal of 31988612 is 21688913.

It can be written as a sum of positive squares in only one way, i.e., 22600516 + 9388096 = 4754^2 + 3064^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3998573 + ... + 3998580.

It is an arithmetic number, because the mean of its divisors is an integer number (9330013).

Almost surely, 2^31988612 is an apocalyptic number.

It is an amenable number.

31988612 is a deficient number, since it is larger than the sum of its proper divisors (23991466).

31988612 is a wasteful number, since it uses less digits than its factorization.

31988612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7997157 (or 7997155 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 31988612 is about 5655.8475934205. The cubic root of 31988612 is about 317.4425448353.

The spelling of 31988612 in words is "thirty-one million, nine hundred eighty-eight thousand, six hundred twelve".