31320310013 has 4 divisors (see below), whose sum is σ = 31320988608. Its totient is φ = 31319631420.

The previous prime is 31320310001. The next prime is 31320310033. The reversal of 31320310013 is 31001302313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31320310013 - 2¹⁴ = 31320293629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31320309973 and 31320310000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320310033) 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, 264581 + ... + 364202.

It is an arithmetic number, because the mean of its divisors is an integer number (7830247152).

Almost surely, 2^31320310013 is an apocalyptic number.

It is an amenable number.

31320310013 is a deficient number, since it is larger than the sum of its proper divisors (678595).

31320310013 is an equidigital number, since it uses as much as digits as its factorization.

31320310013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678594.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 31320310013 its reverse (31001302313), we get a palindrome (62321612326).

The spelling of 31320310013 in words is "thirty-one billion, three hundred twenty million, three hundred ten thousand, thirteen".