312005779 has 2 divisors, whose sum is σ = 312005780. Its totient is φ = 312005778.

The previous prime is 312005717. The next prime is 312005791. The reversal of 312005779 is 977500213.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312005779 is a prime.

It is a super-2 number, since 2×312005779² = 194695212258793682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312008779) 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, 156002889 + 156002890.

It is an arithmetic number, because the mean of its divisors is an integer number (156002890).

Almost surely, 2^312005779 is an apocalyptic number.

312005779 is a deficient number, since it is larger than the sum of its proper divisors (1).

312005779 is an equidigital number, since it uses as much as digits as its factorization.

312005779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 312005779 is about 17663.6853176227. The cubic root of 312005779 is about 678.2464761434.

The spelling of 312005779 in words is "three hundred twelve million, five thousand, seven hundred seventy-nine".