312779989 has 2 divisors, whose sum is σ = 312779990. Its totient is φ = 312779988.

The previous prime is 312779959. The next prime is 312780011. The reversal of 312779989 is 989977213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190854225 + 121925764 = 13815^2 + 11042^2 .

It is an emirp because it is prime and its reverse (989977213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312779989 - 2⁷ = 312779861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312779959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156389994 + 156389995.

It is an arithmetic number, because the mean of its divisors is an integer number (156389995).

Almost surely, 2^312779989 is an apocalyptic number.

It is an amenable number.

312779989 is a deficient number, since it is larger than the sum of its proper divisors (1).

312779989 is an equidigital number, since it uses as much as digits as its factorization.

312779989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 55.

The square root of 312779989 is about 17685.5870414301. The cubic root of 312779989 is about 678.8070122040.

The spelling of 312779989 in words is "three hundred twelve million, seven hundred seventy-nine thousand, nine hundred eighty-nine".