31199113061 has 2 divisors, whose sum is σ = 31199113062. Its totient is φ = 31199113060.

The previous prime is 31199113037. The next prime is 31199113063. The reversal of 31199113061 is 16031199113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25912950625 + 5286162436 = 160975^2 + 72706^2 .

It is a cyclic number.

It is not a de Polignac number, because 31199113061 - 2¹⁰ = 31199112037 is a prime.

It is a Sophie Germain prime.

Together with 31199113063, it forms a pair of twin primes.

It is a Chen 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 (31199113063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15599556530 + 15599556531.

It is an arithmetic number, because the mean of its divisors is an integer number (15599556531).

Almost surely, 2^31199113061 is an apocalyptic number.

It is an amenable number.

31199113061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31199113061 is an equidigital number, since it uses as much as digits as its factorization.

31199113061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The spelling of 31199113061 in words is "thirty-one billion, one hundred ninety-nine million, one hundred thirteen thousand, sixty-one".