871801292209 has 3 divisors (see below), whose sum is σ = 871802225913. Its totient is φ = 871800358506.

The previous prime is 871801292183. The next prime is 871801292227. The reversal of 871801292209 is 902292108178.

The square root of 871801292209 is 933703.

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

871801292209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 871801292209 - 2⁵ = 871801292177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871801292009) 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, 466852 + ... + 1400554.

It is an arithmetic number, because the mean of its divisors is an integer number (290600741971).

Almost surely, 2^871801292209 is an apocalyptic number.

871801292209 is the 933703-rd square number.

871801292209 is the 466852-nd centered octagonal number.

It is an amenable number.

871801292209 is a deficient number, since it is larger than the sum of its proper divisors (933704).

871801292209 is an frugal number, since it uses more digits than its factorization.

871801292209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867406 (or 933703 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 49.

Multiplying 871801292209 by its sum of digits (49), we get a square (42718263318241 = 6535921²).

The spelling of 871801292209 in words is "eight hundred seventy-one billion, eight hundred one million, two hundred ninety-two thousand, two hundred nine".