312897779 has 2 divisors, whose sum is σ = 312897780. Its totient is φ = 312897778.

The previous prime is 312897763. The next prime is 312897803. The reversal of 312897779 is 977798213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312897779 - 2⁴ = 312897763 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 312897779.

It is not a weakly prime, because it can be changed into another prime (312897979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156448889 + 156448890.

It is an arithmetic number, because the mean of its divisors is an integer number (156448890).

Almost surely, 2^312897779 is an apocalyptic number.

312897779 is a deficient number, since it is larger than the sum of its proper divisors (1).

312897779 is an equidigital number, since it uses as much as digits as its factorization.

312897779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 53.

The square root of 312897779 is about 17688.9168407791. The cubic root of 312897779 is about 678.8922122870.

The spelling of 312897779 in words is "three hundred twelve million, eight hundred ninety-seven thousand, seven hundred seventy-nine".