311499779 has 2 divisors, whose sum is σ = 311499780. Its totient is φ = 311499778.

The previous prime is 311499743. The next prime is 311499803. The reversal of 311499779 is 977994113.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 311499779 - 2⁸ = 311499523 is a prime.

It is a super-2 number, since 2×311499779² = 194064224634097682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (311499479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155749889 + 155749890.

It is an arithmetic number, because the mean of its divisors is an integer number (155749890).

Almost surely, 2^311499779 is an apocalyptic number.

311499779 is a deficient number, since it is larger than the sum of its proper divisors (1).

311499779 is an equidigital number, since it uses as much as digits as its factorization.

311499779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 50.

The square root of 311499779 is about 17649.3563338723. The cubic root of 311499779 is about 677.8796256625.

The spelling of 311499779 in words is "three hundred eleven million, four hundred ninety-nine thousand, seven hundred seventy-nine".