809851172 has 48 divisors (see below), whose sum is σ = 1566620160. Its totient is φ = 363975552.

The previous prime is 809851171. The next prime is 809851181. The reversal of 809851172 is 271158908.

It is not an unprimeable number, because it can be changed into a prime (809851171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558953 + ... + 560399.

It is an arithmetic number, because the mean of its divisors is an integer number (32637920).

Almost surely, 2^809851172 is an apocalyptic number.

It is an amenable number.

809851172 is a deficient number, since it is larger than the sum of its proper divisors (756768988).

809851172 is a wasteful number, since it uses less digits than its factorization.

809851172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 809851172 is about 28457.8841799597. The cubic root of 809851172 is about 932.1126565361.

The spelling of 809851172 in words is "eight hundred nine million, eight hundred fifty-one thousand, one hundred seventy-two".