311121269 has 2 divisors, whose sum is σ = 311121270. Its totient is φ = 311121268.

The previous prime is 311121263. The next prime is 311121281. The reversal of 311121269 is 962121113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195300625 + 115820644 = 13975^2 + 10762^2 .

It is a cyclic number.

It is not a de Polignac number, because 311121269 - 2¹² = 311117173 is a prime.

It is a super-2 number, since 2×311121269² = 193592888048340722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311121263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155560634 + 155560635.

It is an arithmetic number, because the mean of its divisors is an integer number (155560635).

Almost surely, 2^311121269 is an apocalyptic number.

It is an amenable number.

311121269 is a deficient number, since it is larger than the sum of its proper divisors (1).

311121269 is an equidigital number, since it uses as much as digits as its factorization.

311121269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 26.

The square root of 311121269 is about 17638.6300204976. The cubic root of 311121269 is about 677.6049457305.

The spelling of 311121269 in words is "three hundred eleven million, one hundred twenty-one thousand, two hundred sixty-nine".