312499999919 has 2 divisors, whose sum is σ = 312499999920. Its totient is φ = 312499999918.

The previous prime is 312499999907. The next prime is 312500000027. The reversal of 312499999919 is 919999994213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312499999919 - 2⁸ = 312499999663 is a prime.

It is a super-2 number, since 2×312499999919² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312499099919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156249999959 + 156249999960.

It is an arithmetic number, because the mean of its divisors is an integer number (156249999960).

Almost surely, 2^312499999919 is an apocalyptic number.

312499999919 is a deficient number, since it is larger than the sum of its proper divisors (1).

312499999919 is an equidigital number, since it uses as much as digits as its factorization.

312499999919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 114791256, while the sum is 74.

The spelling of 312499999919 in words is "three hundred twelve billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred nineteen".