810540193 has 4 divisors (see below), whose sum is σ = 830309508. Its totient is φ = 790770880.

The previous prime is 810540191. The next prime is 810540259. The reversal of 810540193 is 391045018.

810540193 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.

It can be written as a sum of positive squares in 2 ways, for example, as 249418849 + 561121344 = 15793^2 + 23688^2 .

It is a cyclic number.

It is not a de Polignac number, because 810540193 - 2¹ = 810540191 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (810540191) 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, 9884596 + ... + 9884677.

It is an arithmetic number, because the mean of its divisors is an integer number (207577377).

Almost surely, 2^810540193 is an apocalyptic number.

It is an amenable number.

810540193 is a deficient number, since it is larger than the sum of its proper divisors (19769315).

810540193 is a wasteful number, since it uses less digits than its factorization.

810540193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19769314.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 810540193 is about 28469.9875834184. The cubic root of 810540193 is about 932.3769286075.

The spelling of 810540193 in words is "eight hundred ten million, five hundred forty thousand, one hundred ninety-three".