999823142917 has 2 divisors, whose sum is σ = 999823142918. Its totient is φ = 999823142916.

The previous prime is 999823142897. The next prime is 999823142951. The reversal of 999823142917 is 719241328999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991127766916 + 8695376001 = 995554^2 + 93249^2 .

It is a cyclic number.

It is not a de Polignac number, because 999823142917 - 2²⁷ = 999688925189 is a prime.

It is a super-2 number, since 2×999823142917² (a number of 25 digits) contains 22 as substring.

It is a pancake number, because a pancake can be divided into 999823142917 parts by 1414088 straight cuts.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999823148917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499911571458 + 499911571459.

It is an arithmetic number, because the mean of its divisors is an integer number (499911571459).

Almost surely, 2^999823142917 is an apocalyptic number.

It is an amenable number.

999823142917 is a deficient number, since it is larger than the sum of its proper divisors (1).

999823142917 is an equidigital number, since it uses as much as digits as its factorization.

999823142917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 64.

The spelling of 999823142917 in words is "nine hundred ninety-nine billion, eight hundred twenty-three million, one hundred forty-two thousand, nine hundred seventeen".