809689607 has 4 divisors (see below), whose sum is σ = 829438176. Its totient is φ = 789941040.

The previous prime is 809689577. The next prime is 809689637. The reversal of 809689607 is 706986908.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (809689577) and next prime (809689637).

It is a cyclic number.

It is not a de Polignac number, because 809689607 - 2¹⁴ = 809673223 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 (809689637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9874223 + ... + 9874304.

It is an arithmetic number, because the mean of its divisors is an integer number (207359544).

Almost surely, 2^809689607 is an apocalyptic number.

809689607 is a deficient number, since it is larger than the sum of its proper divisors (19748569).

809689607 is a wasteful number, since it uses less digits than its factorization.

809689607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19748568.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 809689607 is about 28455.0453698461. The cubic root of 809689607 is about 932.0506670405.

The spelling of 809689607 in words is "eight hundred nine million, six hundred eighty-nine thousand, six hundred seven".