31312044 has 18 divisors (see below), whose sum is σ = 79149980. Its totient is φ = 10437336.

The previous prime is 31312037. The next prime is 31312049. The reversal of 31312044 is 44021313.

It is a tau number, because it is divible by the number of its divisors (18).

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 (31312049) 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, 434854 + ... + 434925.

Almost surely, 2^31312044 is an apocalyptic number.

It is an amenable number.

31312044 is an abundant number, since it is smaller than the sum of its proper divisors (47837936).

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

31312044 is a wasteful number, since it uses less digits than its factorization.

31312044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869789 (or 869784 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31312044 is about 5595.7165760964. The cubic root of 31312044 is about 315.1885794474.

Adding to 31312044 its reverse (44021313), we get a palindrome (75333357).

The spelling of 31312044 in words is "thirty-one million, three hundred twelve thousand, forty-four".