311212111099 has 2 divisors, whose sum is σ = 311212111100. Its totient is φ = 311212111098.

The previous prime is 311212111097. The next prime is 311212111123. The reversal of 311212111099 is 990111212113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 311212111099 - 2¹ = 311212111097 is a prime.

Together with 311212111097, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 311212111099.

It is not a weakly prime, because it can be changed into another prime (311212111097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155606055549 + 155606055550.

It is an arithmetic number, because the mean of its divisors is an integer number (155606055550).

Almost surely, 2^311212111099 is an apocalyptic number.

311212111099 is a deficient number, since it is larger than the sum of its proper divisors (1).

311212111099 is an equidigital number, since it uses as much as digits as its factorization.

311212111099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 31.

The spelling of 311212111099 in words is "three hundred eleven billion, two hundred twelve million, one hundred eleven thousand, ninety-nine".