809630091 has 48 divisors (see below), whose sum is σ = 1235520000. Its totient is φ = 510209280.

The previous prime is 809630053. The next prime is 809630113. The reversal of 809630091 is 190036908.

It is not a de Polignac number, because 809630091 - 2⁷ = 809629963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (809630051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4238806 + ... + 4238996.

It is an arithmetic number, because the mean of its divisors is an integer number (25740000).

Almost surely, 2^809630091 is an apocalyptic number.

809630091 is a deficient number, since it is larger than the sum of its proper divisors (425889909).

809630091 is a wasteful number, since it uses less digits than its factorization.

809630091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 481 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 809630091 is about 28453.9995606945. Note that the first 3 decimals coincide. The cubic root of 809630091 is about 932.0278297762.

Adding to 809630091 its reverse (190036908), we get a palindrome (999666999).

The spelling of 809630091 in words is "eight hundred nine million, six hundred thirty thousand, ninety-one".