31009912 has 16 divisors (see below), whose sum is σ = 58659840. Its totient is φ = 15367296.

The previous prime is 31009907. The next prime is 31009933. The reversal of 31009912 is 21990013.

It is a super-2 number, since 2×31009912² = 1923229284495488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16248 + ... + 18055.

It is an arithmetic number, because the mean of its divisors is an integer number (3666240).

Almost surely, 2^31009912 is an apocalyptic number.

It is an amenable number.

31009912 is a deficient number, since it is larger than the sum of its proper divisors (27649928).

31009912 is a wasteful number, since it uses less digits than its factorization.

31009912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34422 (or 34418 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 31009912 is about 5568.6544155658. The cubic root of 31009912 is about 314.1715427090.

Adding to 31009912 its reverse (21990013), we get a palindrome (52999925).

The spelling of 31009912 in words is "thirty-one million, nine thousand, nine hundred twelve".