811801 has 9 divisors (see below), whose sum is σ = 878941. Its totient is φ = 749632.

The previous prime is 811799. The next prime is 811819. The reversal of 811801 is 108118.

The square root of 811801 is 901.

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 203401 + 608400 = 451^2 + 780^2 .

It is not a de Polignac number, because 811801 - 2¹ = 811799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811861) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15291 + ... + 15343.

2⁸¹¹⁸⁰¹ is an apocalyptic number.

811801 is the 901-st square number.

811801 is the 451-st centered octagonal number.

It is an amenable number.

811801 is a deficient number, since it is larger than the sum of its proper divisors (67140).

811801 is an equidigital number, since it uses as much as digits as its factorization.

811801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

The cubic root of 811801 is about 93.2860120092.

Multiplying 811801 by its product of nonzero digits (64), we get a square (51955264 = 7208²).

Adding to 811801 its reverse (108118), we get a palindrome (919919).

The spelling of 811801 in words is "eight hundred eleven thousand, eight hundred one".