805141906209 has 9 divisors (see below), whose sum is σ = 1162986641713. Its totient is φ = 536759476212.

The previous prime is 805141906207. The next prime is 805141906243. The reversal of 805141906209 is 902609141508.

The square root of 805141906209 is 897297.

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

805141906209 is a `hidden beast` number, since 8 + 0 + 5 + 1 + 4 + 19 + 0 + 620 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 805141906209 - 2¹ = 805141906207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805141906201) 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 8 ways as a sum of consecutive naturals, for example, 2542342 + ... + 2841440.

Almost surely, 2^805141906209 is an apocalyptic number.

805141906209 is the 897297-th square number.

805141906209 is the 448649-th centered octagonal number.

It is an amenable number.

805141906209 is a deficient number, since it is larger than the sum of its proper divisors (357844735504).

805141906209 is an frugal number, since it uses more digits than its factorization.

805141906209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598204 (or 299102 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 805141906209 in words is "eight hundred five billion, one hundred forty-one million, nine hundred six thousand, two hundred nine".