999313217 has 8 divisors (see below), whose sum is σ = 1144574976. Its totient is φ = 854677152.

The previous prime is 999313207. The next prime is 999313243. The reversal of 999313217 is 712313999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999313217 - 2⁶ = 999313153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999313207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152993 + ... + 159390.

It is an arithmetic number, because the mean of its divisors is an integer number (143071872).

Almost surely, 2^999313217 is an apocalyptic number.

It is an amenable number.

999313217 is a deficient number, since it is larger than the sum of its proper divisors (145261759).

999313217 is a wasteful number, since it uses less digits than its factorization.

999313217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312847.

The product of its digits is 91854, while the sum is 44.

The square root of 999313217 is about 31611.9157439090. The cubic root of 999313217 is about 999.7710199055.

The spelling of 999313217 in words is "nine hundred ninety-nine million, three hundred thirteen thousand, two hundred seventeen".