31109612 has 12 divisors (see below), whose sum is σ = 57307320. Its totient is φ = 14736096.

The previous prime is 31109599. The next prime is 31109621. The reversal of 31109612 is 21690113.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204593 + ... + 204744.

It is an arithmetic number, because the mean of its divisors is an integer number (4775610).

Almost surely, 2^31109612 is an apocalyptic number.

It is an amenable number.

31109612 is a deficient number, since it is larger than the sum of its proper divisors (26197708).

31109612 is a wasteful number, since it uses less digits than its factorization.

31109612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409360 (or 409358 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 31109612 is about 5577.5991250716. The cubic root of 31109612 is about 314.5078802632.

Adding to 31109612 its reverse (21690113), we get a palindrome (52799725).

The spelling of 31109612 in words is "thirty-one million, one hundred nine thousand, six hundred twelve".