312499999 has 6 divisors (see below), whose sum is σ = 363520464. Its totient is φ = 267857100.

The previous prime is 312499987. The next prime is 312500017. The reversal of 312499999 is 999994213.

It is a Cunningham number, because it is equal to 50⁵-1.

It is not a de Polignac number, because 312499999 - 2⁹ = 312499487 is a prime.

It is a Duffinian number.

312499999 is a modest number, since divided by 99999 gives 3124 as remainder.

It is a plaindrome in base 5.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312499949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3188727 + ... + 3188824.

It is an arithmetic number, because the mean of its divisors is an integer number (60586744).

Almost surely, 2^312499999 is an apocalyptic number.

312499999 is a deficient number, since it is larger than the sum of its proper divisors (51020465).

312499999 is an equidigital number, since it uses as much as digits as its factorization.

312499999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6377565 (or 6377558 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 55.

The square root of 312499999 is about 17677.6695013794. The cubic root of 312499999 is about 678.6044034249.

The spelling of 312499999 in words is "three hundred twelve million, four hundred ninety-nine thousand, nine hundred ninety-nine".