811373982169 has 3 divisors (see below), whose sum is σ = 811374882933. Its totient is φ = 811373081406.

The previous prime is 811373982149. The next prime is 811373982179. The reversal of 811373982169 is 961289373118.

The square root of 811373982169 is 900763.

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 a de Polignac number, because none of the positive numbers 2^k-811373982169 is a prime.

It is a super-2 number, since 2×811373982169² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811373982149) 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, 450382 + ... + 1351144.

It is an arithmetic number, because the mean of its divisors is an integer number (270458294311).

Almost surely, 2^811373982169 is an apocalyptic number.

811373982169 is the 900763-rd square number.

811373982169 is the 450382-nd centered octagonal number.

It is an amenable number.

811373982169 is a deficient number, since it is larger than the sum of its proper divisors (900764).

811373982169 is an frugal number, since it uses more digits than its factorization.

811373982169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801526 (or 900763 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 58.

The spelling of 811373982169 in words is "eight hundred eleven billion, three hundred seventy-three million, nine hundred eighty-two thousand, one hundred sixty-nine".