311311961 has 2 divisors, whose sum is σ = 311311962. Its totient is φ = 311311960.

The previous prime is 311311927. The next prime is 311311981. The reversal of 311311961 is 169113113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 311310736 + 1225 = 17644^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-311311961 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 311311961.

It is not a weakly prime, because it can be changed into another prime (311311981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155655980 + 155655981.

It is an arithmetic number, because the mean of its divisors is an integer number (155655981).

Almost surely, 2^311311961 is an apocalyptic number.

It is an amenable number.

311311961 is a deficient number, since it is larger than the sum of its proper divisors (1).

311311961 is an equidigital number, since it uses as much as digits as its factorization.

311311961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 26.

The square root of 311311961 is about 17644.0347143163. The cubic root of 311311961 is about 677.7433563386.

The spelling of 311311961 in words is "three hundred eleven million, three hundred eleven thousand, nine hundred sixty-one".