311121958969 has 2 divisors, whose sum is σ = 311121958970. Its totient is φ = 311121958968.

The previous prime is 311121958907. The next prime is 311121958999. The reversal of 311121958969 is 969859121113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186375250944 + 124746708025 = 431712^2 + 353195^2 .

It is a cyclic number.

It is not a de Polignac number, because 311121958969 - 2⁹ = 311121958457 is a prime.

It is a super-2 number, since 2×311121958969² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (311121958999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560979484 + 155560979485.

It is an arithmetic number, because the mean of its divisors is an integer number (155560979485).

Almost surely, 2^311121958969 is an apocalyptic number.

It is an amenable number.

311121958969 is a deficient number, since it is larger than the sum of its proper divisors (1).

311121958969 is an equidigital number, since it uses as much as digits as its factorization.

311121958969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 55.

The spelling of 311121958969 in words is "three hundred eleven billion, one hundred twenty-one million, nine hundred fifty-eight thousand, nine hundred sixty-nine".