79873109 has 2 divisors, whose sum is σ = 79873110. Its totient is φ = 79873108.

The previous prime is 79873103. The next prime is 79873127. The reversal of 79873109 is 90137897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74218225 + 5654884 = 8615^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 79873109 - 2⁸ = 79872853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79873109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79873103) 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, 39936554 + 39936555.

It is an arithmetic number, because the mean of its divisors is an integer number (39936555).

Almost surely, 2^79873109 is an apocalyptic number.

It is an amenable number.

79873109 is a deficient number, since it is larger than the sum of its proper divisors (1).

79873109 is an equidigital number, since it uses as much as digits as its factorization.

79873109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 79873109 is about 8937.1756724370. The cubic root of 79873109 is about 430.6590021411.

The spelling of 79873109 in words is "seventy-nine million, eight hundred seventy-three thousand, one hundred nine".