823499899 has 2 divisors, whose sum is σ = 823499900. Its totient is φ = 823499898.

The previous prime is 823499891. The next prime is 823499947. The reversal of 823499899 is 998994328.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 823499899 - 2³ = 823499891 is a prime.

It is not a weakly prime, because it can be changed into another prime (823499891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411749949 + 411749950.

It is an arithmetic number, because the mean of its divisors is an integer number (411749950).

Almost surely, 2^823499899 is an apocalyptic number.

823499899 is a deficient number, since it is larger than the sum of its proper divisors (1).

823499899 is an equidigital number, since it uses as much as digits as its factorization.

823499899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 61.

The square root of 823499899 is about 28696.6879447786. The cubic root of 823499899 is about 937.3199271090.

The spelling of 823499899 in words is "eight hundred twenty-three million, four hundred ninety-nine thousand, eight hundred ninety-nine".