311799869 has 2 divisors, whose sum is σ = 311799870. Its totient is φ = 311799868.

The previous prime is 311799857. The next prime is 311799871. The reversal of 311799869 is 968997113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307125625 + 4674244 = 17525^2 + 2162^2 .

It is a cyclic number.

It is not a de Polignac number, because 311799869 - 2¹² = 311795773 is a prime.

It is a super-2 number, since 2×311799869² = 194438316616834322, which contains 22 as substring.

Together with 311799871, it forms a pair of twin primes.

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 311799869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311799809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155899934 + 155899935.

It is an arithmetic number, because the mean of its divisors is an integer number (155899935).

Almost surely, 2^311799869 is an apocalyptic number.

It is an amenable number.

311799869 is a deficient number, since it is larger than the sum of its proper divisors (1).

311799869 is an equidigital number, since it uses as much as digits as its factorization.

311799869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 53.

The square root of 311799869 is about 17657.8557305240. The cubic root of 311799869 is about 678.0972390937.

The spelling of 311799869 in words is "three hundred eleven million, seven hundred ninety-nine thousand, eight hundred sixty-nine".