999823148917 has 2 divisors, whose sum is σ = 999823148918. Its totient is φ = 999823148916.

The previous prime is 999823148911. The next prime is 999823148921. The reversal of 999823148917 is 719841328999.

999823148917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525500307396 + 474322841521 = 724914^2 + 688711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999823148917 is a prime.

It is a super-2 number, since 2×999823148917² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999823148911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499911574458 + 499911574459.

It is an arithmetic number, because the mean of its divisors is an integer number (499911574459).

Almost surely, 2^999823148917 is an apocalyptic number.

It is an amenable number.

999823148917 is a deficient number, since it is larger than the sum of its proper divisors (1).

999823148917 is an equidigital number, since it uses as much as digits as its factorization.

999823148917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70543872, while the sum is 70.

The spelling of 999823148917 in words is "nine hundred ninety-nine billion, eight hundred twenty-three million, one hundred forty-eight thousand, nine hundred seventeen".