79964909 has 2 divisors, whose sum is σ = 79964910. Its totient is φ = 79964908.

The previous prime is 79964897. The next prime is 79964921. The reversal of 79964909 is 90946997.

It is a balanced prime because it is at equal distance from previous prime (79964897) and next prime (79964921).

It can be written as a sum of positive squares in only one way, i.e., 76912900 + 3052009 = 8770^2 + 1747^2 .

It is a cyclic number.

It is not a de Polignac number, because 79964909 - 2²⁰ = 78916333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79964959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39982454 + 39982455.

It is an arithmetic number, because the mean of its divisors is an integer number (39982455).

Almost surely, 2^79964909 is an apocalyptic number.

It is an amenable number.

79964909 is a deficient number, since it is larger than the sum of its proper divisors (1).

79964909 is an equidigital number, since it uses as much as digits as its factorization.

79964909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 79964909 is about 8942.3100483041. The cubic root of 79964909 is about 430.8239277362.

The spelling of 79964909 in words is "seventy-nine million, nine hundred sixty-four thousand, nine hundred nine".