31310073 has 12 divisors (see below), whose sum is σ = 47886228. Its totient is φ = 19645440.

The previous prime is 31310047. The next prime is 31310089. The reversal of 31310073 is 37001313.

It can be written as a sum of positive squares in 2 ways, for example, as 9659664 + 21650409 = 3108^2 + 4653^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31310073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31310003) 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, 102168 + ... + 102473.

It is an arithmetic number, because the mean of its divisors is an integer number (3990519).

Almost surely, 2^31310073 is an apocalyptic number.

It is an amenable number.

31310073 is a deficient number, since it is larger than the sum of its proper divisors (16576155).

31310073 is a wasteful number, since it uses less digits than its factorization.

31310073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204664 (or 204661 counting only the distinct ones).

The product of its (nonzero) digits is 189, while the sum is 18.

The square root of 31310073 is about 5595.5404564707. The cubic root of 31310073 is about 315.1819659142.

Adding to 31310073 its reverse (37001313), we get a palindrome (68311386).

The spelling of 31310073 in words is "thirty-one million, three hundred ten thousand, seventy-three".