311211320051 has 2 divisors, whose sum is σ = 311211320052. Its totient is φ = 311211320050.

The previous prime is 311211320039. The next prime is 311211320087. The reversal of 311211320051 is 150023112113.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311211320051 is a prime.

It is not a weakly prime, because it can be changed into another prime (311211320351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155605660025 + 155605660026.

It is an arithmetic number, because the mean of its divisors is an integer number (155605660026).

Almost surely, 2^311211320051 is an apocalyptic number.

311211320051 is a deficient number, since it is larger than the sum of its proper divisors (1).

311211320051 is an equidigital number, since it uses as much as digits as its factorization.

311211320051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 311211320051 its reverse (150023112113), we get a palindrome (461234432164).

The spelling of 311211320051 in words is "three hundred eleven billion, two hundred eleven million, three hundred twenty thousand, fifty-one".