31320112013 has 2 divisors, whose sum is σ = 31320112014. Its totient is φ = 31320112012.

The previous prime is 31320112009. The next prime is 31320112049. The reversal of 31320112013 is 31021102313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25223157124 + 6096954889 = 158818^2 + 78083^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320112013 - 2² = 31320112009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31320111982 and 31320112000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31320112513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660056006 + 15660056007.

It is an arithmetic number, because the mean of its divisors is an integer number (15660056007).

Almost surely, 2^31320112013 is an apocalyptic number.

It is an amenable number.

31320112013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320112013 is an equidigital number, since it uses as much as digits as its factorization.

31320112013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31320112013 its reverse (31021102313), we get a palindrome (62341214326).

The spelling of 31320112013 in words is "thirty-one billion, three hundred twenty million, one hundred twelve thousand, thirteen".