999099823 has 2 divisors, whose sum is σ = 999099824. Its totient is φ = 999099822.

The previous prime is 999099817. The next prime is 999099833. The reversal of 999099823 is 328990999.

It is a weak prime.

It is an emirp because it is prime and its reverse (328990999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999099823 - 2¹³ = 999091631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999099833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499549911 + 499549912.

It is an arithmetic number, because the mean of its divisors is an integer number (499549912).

Almost surely, 2^999099823 is an apocalyptic number.

999099823 is a deficient number, since it is larger than the sum of its proper divisors (1).

999099823 is an equidigital number, since it uses as much as digits as its factorization.

999099823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2834352, while the sum is 58.

The square root of 999099823 is about 31608.5403490892. The cubic root of 999099823 is about 999.6998509195.

The spelling of 999099823 in words is "nine hundred ninety-nine million, ninety-nine thousand, eight hundred twenty-three".