8291361809 has 2 divisors, whose sum is σ = 8291361810. Its totient is φ = 8291361808.

The previous prime is 8291361763. The next prime is 8291361811. The reversal of 8291361809 is 9081631928.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7494711184 + 796650625 = 86572^2 + 28225^2 .

It is a cyclic number.

It is not a de Polignac number, because 8291361809 - 2³² = 3996394513 is a prime.

Together with 8291361811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8291361889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4145680904 + 4145680905.

It is an arithmetic number, because the mean of its divisors is an integer number (4145680905).

Almost surely, 2^8291361809 is an apocalyptic number.

It is an amenable number.

8291361809 is a deficient number, since it is larger than the sum of its proper divisors (1).

8291361809 is an equidigital number, since it uses as much as digits as its factorization.

8291361809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 8291361809 is about 91056.9152179009. The cubic root of 8291361809 is about 2023.9912109146.

The spelling of 8291361809 in words is "eight billion, two hundred ninety-one million, three hundred sixty-one thousand, eight hundred nine".