31512042 has 12 divisors (see below), whose sum is σ = 68276130. Its totient is φ = 10504008.

The previous prime is 31512037. The next prime is 31512059. The reversal of 31512042 is 24021513.

It can be written as a sum of positive squares in only one way, i.e., 29582721 + 1929321 = 5439^2 + 1389^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1750669 = 31512042 / (3 + 1 + 5 + 1 + 2 + 0 + 4 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 875317 + ... + 875352.

Almost surely, 2^31512042 is an apocalyptic number.

31512042 is an abundant number, since it is smaller than the sum of its proper divisors (36764088).

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

31512042 is a wasteful number, since it uses less digits than its factorization.

31512042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750677 (or 1750674 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31512042 is about 5613.5587642778. The cubic root of 31512042 is about 315.8582189897.

Adding to 31512042 its reverse (24021513), we get a palindrome (55533555).

The spelling of 31512042 in words is "thirty-one million, five hundred twelve thousand, forty-two".