810261 has 12 divisors (see below), whose sum is σ = 1178892. Its totient is φ = 536256.

The previous prime is 810259. The next prime is 810269. The reversal of 810261 is 162018.

810261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 756900 + 53361 = 870^2 + 231^2 .

It is not a de Polignac number, because 810261 - 2¹ = 810259 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 810261.

It is not an unprimeable number, because it can be changed into a prime (810269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1545 + ... + 2001.

It is an arithmetic number, because the mean of its divisors is an integer number (98241).

2⁸¹⁰²⁶¹ is an apocalyptic number.

It is an amenable number.

810261 is a deficient number, since it is larger than the sum of its proper divisors (368631).

810261 is a wasteful number, since it uses less digits than its factorization.

810261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 810261 is about 900.1449883213. The cubic root of 810261 is about 93.2269862971.

Adding to 810261 its reverse (162018), we get a palindrome (972279).

The spelling of 810261 in words is "eight hundred ten thousand, two hundred sixty-one".