31320300013 has 4 divisors (see below), whose sum is σ = 33162670620. Its totient is φ = 29477929408.

The previous prime is 31320300007. The next prime is 31320300031. The reversal of 31320300013 is 31000302313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31000302313 = 23 ⋅1347839231.

It can be written as a sum of positive squares in 2 ways, for example, as 14628176809 + 16692123204 = 120947^2 + 129198^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320300013 - 2³³ = 22730365421 is a prime.

It is a super-2 number, since 2×31320300013² (a number of 22 digits) contains 22 as substring.

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 31320300013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320300043) 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, 921185278 + ... + 921185311.

It is an arithmetic number, because the mean of its divisors is an integer number (8290667655).

Almost surely, 2^31320300013 is an apocalyptic number.

It is an amenable number.

31320300013 is a deficient number, since it is larger than the sum of its proper divisors (1842370607).

31320300013 is a wasteful number, since it uses less digits than its factorization.

31320300013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842370606.

The product of its (nonzero) digits is 162, while the sum is 16.

Adding to 31320300013 its reverse (31000302313), we get a palindrome (62320602326).

The spelling of 31320300013 in words is "thirty-one billion, three hundred twenty million, three hundred thousand, thirteen".