312311999 has 4 divisors (see below), whose sum is σ = 315075936. Its totient is φ = 309548064.

The previous prime is 312311983. The next prime is 312312001. The reversal of 312311999 is 999113213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 312311999 - 2⁴ = 312311983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312311929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1381799 + ... + 1382024.

It is an arithmetic number, because the mean of its divisors is an integer number (78768984).

Almost surely, 2^312311999 is an apocalyptic number.

312311999 is a deficient number, since it is larger than the sum of its proper divisors (2763937).

312311999 is a wasteful number, since it uses less digits than its factorization.

312311999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2763936.

The product of its digits is 13122, while the sum is 38.

The square root of 312311999 is about 17672.3512583923. The cubic root of 312311999 is about 678.4682933232.

The spelling of 312311999 in words is "three hundred twelve million, three hundred eleven thousand, nine hundred ninety-nine".