79130509 has 2 divisors, whose sum is σ = 79130510. Its totient is φ = 79130508.

The previous prime is 79130501. The next prime is 79130521. The reversal of 79130509 is 90503197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41344900 + 37785609 = 6430^2 + 6147^2 .

It is an emirp because it is prime and its reverse (90503197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79130509 - 2³ = 79130501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79130501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39565254 + 39565255.

It is an arithmetic number, because the mean of its divisors is an integer number (39565255).

Almost surely, 2^79130509 is an apocalyptic number.

It is an amenable number.

79130509 is a deficient number, since it is larger than the sum of its proper divisors (1).

79130509 is an equidigital number, since it uses as much as digits as its factorization.

79130509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 79130509 is about 8895.5330925133. The cubic root of 79130509 is about 429.3201967971.

The spelling of 79130509 in words is "seventy-nine million, one hundred thirty thousand, five hundred nine".