312557979949 has 2 divisors, whose sum is σ = 312557979950. Its totient is φ = 312557979948.

The previous prime is 312557979919. The next prime is 312557979967. The reversal of 312557979949 is 949979755213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232692393924 + 79865586025 = 482382^2 + 282605^2 .

It is an emirp because it is prime and its reverse (949979755213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312557979949 - 2¹³ = 312557971757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312557979919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156278989974 + 156278989975.

It is an arithmetic number, because the mean of its divisors is an integer number (156278989975).

Almost surely, 2^312557979949 is an apocalyptic number.

It is an amenable number.

312557979949 is a deficient number, since it is larger than the sum of its proper divisors (1).

312557979949 is an equidigital number, since it uses as much as digits as its factorization.

312557979949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192893400, while the sum is 70.

The spelling of 312557979949 in words is "three hundred twelve billion, five hundred fifty-seven million, nine hundred seventy-nine thousand, nine hundred forty-nine".