79827109 has 2 divisors, whose sum is σ = 79827110. Its totient is φ = 79827108.

The previous prime is 79827107. The next prime is 79827133. The reversal of 79827109 is 90172897.

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., 76300225 + 3526884 = 8735^2 + 1878^2 .

It is an emirp because it is prime and its reverse (90172897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79827109 - 2¹ = 79827107 is a prime.

Together with 79827107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79827107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39913554 + 39913555.

It is an arithmetic number, because the mean of its divisors is an integer number (39913555).

Almost surely, 2^79827109 is an apocalyptic number.

It is an amenable number.

79827109 is a deficient number, since it is larger than the sum of its proper divisors (1).

79827109 is an equidigital number, since it uses as much as digits as its factorization.

79827109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 79827109 is about 8934.6017818367. The cubic root of 79827109 is about 430.5763121571.

The spelling of 79827109 in words is "seventy-nine million, eight hundred twenty-seven thousand, one hundred nine".