312779 has 2 divisors, whose sum is σ = 312780. Its totient is φ = 312778.

The previous prime is 312773. The next prime is 312799. The reversal of 312779 is 977213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312779 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (312773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156389 + 156390.

It is an arithmetic number, because the mean of its divisors is an integer number (156390).

2³¹²⁷⁷⁹ is an apocalyptic number.

312779 is a deficient number, since it is larger than the sum of its proper divisors (1).

312779 is an equidigital number, since it uses as much as digits as its factorization.

312779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 29.

The square root of 312779 is about 559.2664838876. The cubic root of 312779 is about 67.8806296748.

The spelling of 312779 in words is "three hundred twelve thousand, seven hundred seventy-nine".