31311220099 has 2 divisors, whose sum is σ = 31311220100. Its totient is φ = 31311220098.

The previous prime is 31311220063. The next prime is 31311220117. The reversal of 31311220099 is 99002211313.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31311220099 - 2⁷ = 31311219971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31311220099.

It is not a weakly prime, because it can be changed into another prime (31311220009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15655610049 + 15655610050.

It is an arithmetic number, because the mean of its divisors is an integer number (15655610050).

Almost surely, 2^31311220099 is an apocalyptic number.

31311220099 is a deficient number, since it is larger than the sum of its proper divisors (1).

31311220099 is an equidigital number, since it uses as much as digits as its factorization.

31311220099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 31.

The spelling of 31311220099 in words is "thirty-one billion, three hundred eleven million, two hundred twenty thousand, ninety-nine".