805481161 has 9 divisors (see below), whose sum is σ = 816440629. Its totient is φ = 794668000.

The previous prime is 805481143. The next prime is 805481207. The reversal of 805481161 is 161184508.

It is a happy number.

The square root of 805481161 is 28381.

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

It can be written as a sum of positive squares in 4 ways, for example, as 386869561 + 418611600 = 19669^2 + 20460^2 .

It is not a de Polignac number, because 805481161 - 2¹⁵ = 805448393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805484161) 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 8 ways as a sum of consecutive naturals, for example, 2866341 + ... + 2866621.

Almost surely, 2^805481161 is an apocalyptic number.

805481161 is the 28381-st square number.

805481161 is the 14191-st centered octagonal number.

It is an amenable number.

805481161 is a deficient number, since it is larger than the sum of its proper divisors (10959468).

805481161 is an frugal number, since it uses more digits than its factorization.

805481161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 34.

The cubic root of 805481161 is about 930.4330511046.

The spelling of 805481161 in words is "eight hundred five million, four hundred eighty-one thousand, one hundred sixty-one".