809056247 has 2 divisors, whose sum is σ = 809056248. Its totient is φ = 809056246.

The previous prime is 809056229. The next prime is 809056253. The reversal of 809056247 is 742650908.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 809056247 - 2⁸ = 809055991 is a prime.

It is a Chen prime.

It is equal to p_41588096 and since 809056247 and 41588096 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (809056217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404528123 + 404528124.

It is an arithmetic number, because the mean of its divisors is an integer number (404528124).

Almost surely, 2^809056247 is an apocalyptic number.

809056247 is a deficient number, since it is larger than the sum of its proper divisors (1).

809056247 is an equidigital number, since it uses as much as digits as its factorization.

809056247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 809056247 is about 28443.9140590742. The cubic root of 809056247 is about 931.8075789919.

The spelling of 809056247 in words is "eight hundred nine million, fifty-six thousand, two hundred forty-seven".