31313009 has 12 divisors (see below), whose sum is σ = 39228084. Its totient is φ = 24774624.

The previous prime is 31312999. The next prime is 31313017. The reversal of 31313009 is 90031313.

It can be written as a sum of positive squares in 2 ways, for example, as 11242609 + 20070400 = 3353^2 + 4480^2 .

It is not a de Polignac number, because 31313009 - 2⁸ = 31312753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31313039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23942 + ... + 25215.

It is an arithmetic number, because the mean of its divisors is an integer number (3269007).

Almost surely, 2^31313009 is an apocalyptic number.

It is an amenable number.

31313009 is a deficient number, since it is larger than the sum of its proper divisors (7915075).

31313009 is a wasteful number, since it uses less digits than its factorization.

31313009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49184 (or 49177 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 20.

The square root of 31313009 is about 5595.8028021009. The cubic root of 31313009 is about 315.1918173267.

The spelling of 31313009 in words is "thirty-one million, three hundred thirteen thousand, nine".