805357271889 has 15 divisors (see below), whose sum is σ = 1203076632043. Its totient is φ = 536899463424.

The previous prime is 805357271881. The next prime is 805357271899. The reversal of 805357271889 is 988172753508.

The square root of 805357271889 is 897417.

It is a perfect power (a square), and thus also a powerful number.

805357271889 is a `hidden beast` number, since 8 + 0 + 5 + 357 + 271 + 8 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 156353022225 + 649004249664 = 395415^2 + 805608^2 .

It is not a de Polignac number, because 805357271889 - 2³ = 805357271881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805357271881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 8026897 + ... + 8126609.

Almost surely, 2^805357271889 is an apocalyptic number.

805357271889 is the 897417-th square number.

805357271889 is the 448709-th centered octagonal number.

It is an amenable number.

805357271889 is a deficient number, since it is larger than the sum of its proper divisors (397719360154).

805357271889 is an frugal number, since it uses more digits than its factorization.

805357271889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199438 (or 99716 counting only the distinct ones).

The product of its (nonzero) digits is 33868800, while the sum is 63.

The spelling of 805357271889 in words is "eight hundred five billion, three hundred fifty-seven million, two hundred seventy-one thousand, eight hundred eighty-nine".