816911659 has 16 divisors (see below), whose sum is σ = 894309120. Its totient is φ = 742855680.

The previous prime is 816911657. The next prime is 816911681. The reversal of 816911659 is 956119618.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 816911659 - 2¹ = 816911657 is a prime.

It is a super-2 number, since 2×816911659² = 1334689317220264562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816911657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594297 + ... + 595669.

It is an arithmetic number, because the mean of its divisors is an integer number (55894320).

Almost surely, 2^816911659 is an apocalyptic number.

816911659 is a deficient number, since it is larger than the sum of its proper divisors (77397461).

816911659 is a wasteful number, since it uses less digits than its factorization.

816911659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550.

The product of its digits is 116640, while the sum is 46.

The square root of 816911659 is about 28581.6664839544. Note that the first 3 decimals coincide. The cubic root of 816911659 is about 934.8136202801.

The spelling of 816911659 in words is "eight hundred sixteen million, nine hundred eleven thousand, six hundred fifty-nine".