809964915 has 16 divisors (see below), whose sum is σ = 1372176288. Its totient is φ = 406570496.

The previous prime is 809964901. The next prime is 809964973. The reversal of 809964915 is 519469908.

It is a cyclic number.

It is not a de Polignac number, because 809964915 - 2²⁷ = 675747187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1587912 + ... + 1588421.

It is an arithmetic number, because the mean of its divisors is an integer number (85761018).

Almost surely, 2^809964915 is an apocalyptic number.

809964915 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

809964915 is a deficient number, since it is larger than the sum of its proper divisors (562211373).

809964915 is a wasteful number, since it uses less digits than its factorization.

809964915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3176358.

The product of its (nonzero) digits is 699840, while the sum is 51.

The square root of 809964915 is about 28459.8825542201. The cubic root of 809964915 is about 932.1562926718.

The spelling of 809964915 in words is "eight hundred nine million, nine hundred sixty-four thousand, nine hundred fifteen".