79243009 has 2 divisors, whose sum is σ = 79243010. Its totient is φ = 79243008.

The previous prime is 79242997. The next prime is 79243039. The reversal of 79243009 is 90034297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45603009 + 33640000 = 6753^2 + 5800^2 .

It is a cyclic number.

It is not a de Polignac number, because 79243009 - 2⁷ = 79242881 is a prime.

It is not a weakly prime, because it can be changed into another prime (79243039) 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, 39621504 + 39621505.

It is an arithmetic number, because the mean of its divisors is an integer number (39621505).

Almost surely, 2^79243009 is an apocalyptic number.

It is an amenable number.

79243009 is a deficient number, since it is larger than the sum of its proper divisors (1).

79243009 is an equidigital number, since it uses as much as digits as its factorization.

79243009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 79243009 is about 8901.8542450436. The cubic root of 79243009 is about 429.5235555779.

The spelling of 79243009 in words is "seventy-nine million, two hundred forty-three thousand, nine".