809731822201 has 3 divisors (see below), whose sum is σ = 809732722053. Its totient is φ = 809730922350.

The previous prime is 809731822189. The next prime is 809731822231. The reversal of 809731822201 is 102228137908.

The square root of 809731822201 is 899851.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 809731822201 - 2³¹ = 807584338553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809731822231) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 449926 + ... + 1349776.

It is an arithmetic number, because the mean of its divisors is an integer number (269910907351).

Almost surely, 2^809731822201 is an apocalyptic number.

809731822201 is the 899851-st square number.

809731822201 is the 449926-th centered octagonal number.

It is an amenable number.

809731822201 is a deficient number, since it is larger than the sum of its proper divisors (899852).

809731822201 is an frugal number, since it uses more digits than its factorization.

809731822201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799702 (or 899851 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 809731822201 in words is "eight hundred nine billion, seven hundred thirty-one million, eight hundred twenty-two thousand, two hundred one".