809714869 has 2 divisors, whose sum is σ = 809714870. Its totient is φ = 809714868.

The previous prime is 809714861. The next prime is 809714891. The reversal of 809714869 is 968417908.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458602225 + 351112644 = 21415^2 + 18738^2 .

It is a cyclic number.

It is not a de Polignac number, because 809714869 - 2³ = 809714861 is a prime.

It is a super-2 number, since 2×809714869² = 1311276338159374322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809714861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404857434 + 404857435.

It is an arithmetic number, because the mean of its divisors is an integer number (404857435).

Almost surely, 2^809714869 is an apocalyptic number.

It is an amenable number.

809714869 is a deficient number, since it is larger than the sum of its proper divisors (1).

809714869 is an equidigital number, since it uses as much as digits as its factorization.

809714869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 809714869 is about 28455.4892595436. The cubic root of 809714869 is about 932.0603601455.

The spelling of 809714869 in words is "eight hundred nine million, seven hundred fourteen thousand, eight hundred sixty-nine".