30931063961813 has 2 divisors, whose sum is σ = 30931063961814. Its totient is φ = 30931063961812.

The previous prime is 30931063961767. The next prime is 30931063961851. The reversal of 30931063961813 is 31816936013903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26294763576964 + 4636300384849 = 5127842^2 + 2153207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30931063961813 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30931063960813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15465531980906 + 15465531980907.

It is an arithmetic number, because the mean of its divisors is an integer number (15465531980907).

Almost surely, 2^{30931063961813} is an apocalyptic number.

It is an amenable number.

30931063961813 is a deficient number, since it is larger than the sum of its proper divisors (1).

30931063961813 is an equidigital number, since it uses as much as digits as its factorization.

30931063961813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The spelling of 30931063961813 in words is "thirty trillion, nine hundred thirty-one billion, sixty-three million, nine hundred sixty-one thousand, eight hundred thirteen".