816962809 has 16 divisors (see below), whose sum is σ = 917593600. Its totient is φ = 722234880.

The previous prime is 816962807. The next prime is 816962819. The reversal of 816962809 is 908269618.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 816962809 - 2¹ = 816962807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816962807) 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 in 15 ways as a sum of consecutive naturals, for example, 28642 + ... + 49540.

It is an arithmetic number, because the mean of its divisors is an integer number (57349600).

Almost surely, 2^816962809 is an apocalyptic number.

It is an amenable number.

816962809 is a deficient number, since it is larger than the sum of its proper divisors (100630791).

816962809 is a wasteful number, since it uses less digits than its factorization.

816962809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21040.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 816962809 is about 28582.5612743155. The cubic root of 816962809 is about 934.8331306389.

The spelling of 816962809 in words is "eight hundred sixteen million, nine hundred sixty-two thousand, eight hundred nine".