999523999 has 2 divisors, whose sum is σ = 999524000. Its totient is φ = 999523998.

The previous prime is 999523981. The next prime is 999524039. The reversal of 999523999 is 999325999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999523999 - 2²⁵ = 965969567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999523999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999523939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499761999 + 499762000.

It is an arithmetic number, because the mean of its divisors is an integer number (499762000).

Almost surely, 2^999523999 is an apocalyptic number.

999523999 is a deficient number, since it is larger than the sum of its proper divisors (1).

999523999 is an equidigital number, since it uses as much as digits as its factorization.

999523999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15943230, while the sum is 64.

The square root of 999523999 is about 31615.2494692039. The cubic root of 999523999 is about 999.8413078181.

The spelling of 999523999 in words is "nine hundred ninety-nine million, five hundred twenty-three thousand, nine hundred ninety-nine".