31331132323313 has 4 divisors (see below), whose sum is σ = 31490173604340. Its totient is φ = 31172091042288.

The previous prime is 31331132323303. The next prime is 31331132323327. The reversal of 31331132323313 is 31332323113313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24689440509409 + 6641691813904 = 4968847^2 + 2577148^2 .

It is a cyclic number.

It is not a de Polignac number, because 31331132323313 - 2¹⁸ = 31331132061169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31331132323313.

It is not an unprimeable number, because it can be changed into a prime (31331132323303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79520640218 + ... + 79520640611.

It is an arithmetic number, because the mean of its divisors is an integer number (7872543401085).

Almost surely, 2^{31331132323313} is an apocalyptic number.

It is an amenable number.

31331132323313 is a deficient number, since it is larger than the sum of its proper divisors (159041281027).

31331132323313 is a wasteful number, since it uses less digits than its factorization.

31331132323313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159041281026.

The product of its digits is 26244, while the sum is 32.

Adding to 31331132323313 its reverse (31332323113313), we get a palindrome (62663455436626).

The spelling of 31331132323313 in words is "thirty-one trillion, three hundred thirty-one billion, one hundred thirty-two million, three hundred twenty-three thousand, three hundred thirteen".