31307112 has 24 divisors (see below), whose sum is σ = 84790290. Its totient is φ = 10435680.

The previous prime is 31307099. The next prime is 31307119. The reversal of 31307112 is 21170313.

It can be written as a sum of positive squares in only one way, i.e., 20848356 + 10458756 = 4566^2 + 3234^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31307119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217339 + ... + 217482.

Almost surely, 2^31307112 is an apocalyptic number.

It is an amenable number.

31307112 is an abundant number, since it is smaller than the sum of its proper divisors (53483178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31307112 is a wasteful number, since it uses less digits than its factorization.

31307112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434833 (or 434826 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 31307112 is about 5595.2758645128. The cubic root of 31307112 is about 315.1720299934.

Adding to 31307112 its reverse (21170313), we get a palindrome (52477425).

The spelling of 31307112 in words is "thirty-one million, three hundred seven thousand, one hundred twelve".