999917879297 has 2 divisors, whose sum is σ = 999917879298. Its totient is φ = 999917879296.

The previous prime is 999917879281. The next prime is 999917879437. The reversal of 999917879297 is 792978719999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 915908334961 + 84009544336 = 957031^2 + 289844^2 .

It is a cyclic number.

It is not a de Polignac number, because 999917879297 - 2⁴ = 999917879281 is a prime.

It is a super-2 number, since 2×999917879297² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999917879227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499958939648 + 499958939649.

It is an arithmetic number, because the mean of its divisors is an integer number (499958939649).

It is a Proth number, since it is equal to 238399 ⋅ 2²² + 1 and 238399 < 2²².

Almost surely, 2^999917879297 is an apocalyptic number.

It is an amenable number.

999917879297 is a deficient number, since it is larger than the sum of its proper divisors (1).

999917879297 is an equidigital number, since it uses as much as digits as its factorization.

999917879297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916548208, while the sum is 86.

The spelling of 999917879297 in words is "nine hundred ninety-nine billion, nine hundred seventeen million, eight hundred seventy-nine thousand, two hundred ninety-seven".