810490189 has 4 divisors (see below), whose sum is σ = 812532124. Its totient is φ = 808448256.

The previous prime is 810490129. The next prime is 810490229. The reversal of 810490189 is 981094018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 981094018 = 2 ⋅490547009.

It can be written as a sum of positive squares in 2 ways, for example, as 663474564 + 147015625 = 25758^2 + 12125^2 .

It is a cyclic number.

It is not a de Polignac number, because 810490189 - 2⁷ = 810490061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (810490129) 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, 1020372 + ... + 1021165.

It is an arithmetic number, because the mean of its divisors is an integer number (203133031).

Almost surely, 2^810490189 is an apocalyptic number.

It is an amenable number.

810490189 is a deficient number, since it is larger than the sum of its proper divisors (2041935).

810490189 is a wasteful number, since it uses less digits than its factorization.

810490189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041934.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 810490189 is about 28469.1093819248. The cubic root of 810490189 is about 932.3577547548.

The spelling of 810490189 in words is "eight hundred ten million, four hundred ninety thousand, one hundred eighty-nine".