31309112 has 16 divisors (see below), whose sum is σ = 61794600. Its totient is φ = 14830560.

The previous prime is 31309111. The next prime is 31309127. The reversal of 31309112 is 21190313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31309111) 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, 102839 + ... + 103142.

Almost surely, 2^31309112 is an apocalyptic number.

It is an amenable number.

31309112 is a deficient number, since it is larger than the sum of its proper divisors (30485488).

31309112 is a wasteful number, since it uses less digits than its factorization.

31309112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206006 (or 206002 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 31309112 is about 5595.4545838564. The cubic root of 31309112 is about 315.1787412548.

Adding to 31309112 its reverse (21190313), we get a palindrome (52499425).

The spelling of 31309112 in words is "thirty-one million, three hundred nine thousand, one hundred twelve".