816949999 has 2 divisors, whose sum is σ = 816950000. Its totient is φ = 816949998.

The previous prime is 816949951. The next prime is 816950009. The reversal of 816949999 is 999949618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816949999 - 2⁷ = 816949871 is a prime.

It is a super-2 number, since 2×816949999² = 1334814601732200002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 816949999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816949919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408474999 + 408475000.

It is an arithmetic number, because the mean of its divisors is an integer number (408475000).

Almost surely, 2^816949999 is an apocalyptic number.

816949999 is a deficient number, since it is larger than the sum of its proper divisors (1).

816949999 is an equidigital number, since it uses as much as digits as its factorization.

816949999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11337408, while the sum is 64.

The square root of 816949999 is about 28582.3371857516. The cubic root of 816949999 is about 934.8282445434.

The spelling of 816949999 in words is "eight hundred sixteen million, nine hundred forty-nine thousand, nine hundred ninety-nine".