809218475 has 18 divisors (see below), whose sum is σ = 1086561036. Its totient is φ = 597573600.

The previous prime is 809218463. The next prime is 809218477. The reversal of 809218475 is 574812908.

It is a de Polignac number, because none of the positive numbers 2^k-809218475 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809218477) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 91541 + ... + 99990.

It is an arithmetic number, because the mean of its divisors is an integer number (60364502).

Almost surely, 2^809218475 is an apocalyptic number.

809218475 is a deficient number, since it is larger than the sum of its proper divisors (277342561).

809218475 is a wasteful number, since it uses less digits than its factorization.

809218475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191567 (or 191549 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 809218475 is about 28446.7656333721. The cubic root of 809218475 is about 931.8698553285.

The spelling of 809218475 in words is "eight hundred nine million, two hundred eighteen thousand, four hundred seventy-five".