31320304013 has 2 divisors, whose sum is σ = 31320304014. Its totient is φ = 31320304012.

The previous prime is 31320303979. The next prime is 31320304019. The reversal of 31320304013 is 31040302313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21980434564 + 9339869449 = 148258^2 + 96643^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320304013 - 2¹² = 31320299917 is a prime.

It is a super-2 number, since 2×31320304013² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31320304019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660152006 + 15660152007.

It is an arithmetic number, because the mean of its divisors is an integer number (15660152007).

Almost surely, 2^31320304013 is an apocalyptic number.

It is an amenable number.

31320304013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320304013 is an equidigital number, since it uses as much as digits as its factorization.

31320304013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31320304013 its reverse (31040302313), we get a palindrome (62360606326).

The spelling of 31320304013 in words is "thirty-one billion, three hundred twenty million, three hundred four thousand, thirteen".