79086209 has 2 divisors, whose sum is σ = 79086210. Its totient is φ = 79086208.

The previous prime is 79086199. The next prime is 79086211. The reversal of 79086209 is 90268097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68425984 + 10660225 = 8272^2 + 3265^2 .

It is a cyclic number.

It is not a de Polignac number, because 79086209 - 2⁸ = 79085953 is a prime.

Together with 79086211, 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 (79086409) 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 as a sum of consecutive naturals, namely, 39543104 + 39543105.

It is an arithmetic number, because the mean of its divisors is an integer number (39543105).

Almost surely, 2^79086209 is an apocalyptic number.

It is an amenable number.

79086209 is a deficient number, since it is larger than the sum of its proper divisors (1).

79086209 is an equidigital number, since it uses as much as digits as its factorization.

79086209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 79086209 is about 8893.0427301346. The cubic root of 79086209 is about 429.2400657360.

The spelling of 79086209 in words is "seventy-nine million, eighty-six thousand, two hundred nine".