31313442 has 32 divisors (see below), whose sum is σ = 66014208. Its totient is φ = 9882576.

The previous prime is 31313389. The next prime is 31313453. The reversal of 31313442 is 24431313.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13113 + ... + 15315.

It is an arithmetic number, because the mean of its divisors is an integer number (2062944).

Almost surely, 2^31313442 is an apocalyptic number.

31313442 is an abundant number, since it is smaller than the sum of its proper divisors (34700766).

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

31313442 is a wasteful number, since it uses less digits than its factorization.

31313442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334.

The product of its digits is 864, while the sum is 21.

The square root of 31313442 is about 5595.8414916793. The cubic root of 31313442 is about 315.1932701566.

Adding to 31313442 its reverse (24431313), we get a palindrome (55744755).

The spelling of 31313442 in words is "thirty-one million, three hundred thirteen thousand, four hundred forty-two".