999812017 has 2 divisors, whose sum is σ = 999812018. Its totient is φ = 999812016.

The previous prime is 999811999. The next prime is 999812063. The reversal of 999812017 is 710218999.

It is a happy number.

It is an a-pointer prime, because the next prime (999812063) can be obtained adding 999812017 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 753447601 + 246364416 = 27449^2 + 15696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999812017 is a prime.

It is not a weakly prime, because it can be changed into another prime (999812117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499906008 + 499906009.

It is an arithmetic number, because the mean of its divisors is an integer number (499906009).

Almost surely, 2^999812017 is an apocalyptic number.

It is an amenable number.

999812017 is a deficient number, since it is larger than the sum of its proper divisors (1).

999812017 is an equidigital number, since it uses as much as digits as its factorization.

999812017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 999812017 is about 31619.8041897795. The cubic root of 999812017 is about 999.9373350732.

The spelling of 999812017 in words is "nine hundred ninety-nine million, eight hundred twelve thousand, seventeen".