810898409 has 4 divisors (see below), whose sum is σ = 811789440. Its totient is φ = 810007380.

The previous prime is 810898399. The next prime is 810898433. The reversal of 810898409 is 904898018.

810898409 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 Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904898018 = 2 ⋅452449009.

It is a cyclic number.

It is not a de Polignac number, because 810898409 - 2¹⁶ = 810832873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (810898469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444149 + ... + 445970.

It is an arithmetic number, because the mean of its divisors is an integer number (202947360).

Almost surely, 2^810898409 is an apocalyptic number.

It is an amenable number.

810898409 is a deficient number, since it is larger than the sum of its proper divisors (891031).

810898409 is an equidigital number, since it uses as much as digits as its factorization.

810898409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891030.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 810898409 is about 28476.2780046831. The cubic root of 810898409 is about 932.5142621810.

It can be divided in two parts, 81089 and 8409, that added together give a palindrome (89498).

The spelling of 810898409 in words is "eight hundred ten million, eight hundred ninety-eight thousand, four hundred nine".