79254809 has 2 divisors, whose sum is σ = 79254810. Its totient is φ = 79254808.

The previous prime is 79254779. The next prime is 79254811. The reversal of 79254809 is 90845297.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72726784 + 6528025 = 8528^2 + 2555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79254809 is a prime.

Together with 79254811, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79254809.

It is not a weakly prime, because it can be changed into another prime (79254829) 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, 39627404 + 39627405.

It is an arithmetic number, because the mean of its divisors is an integer number (39627405).

Almost surely, 2^79254809 is an apocalyptic number.

It is an amenable number.

79254809 is a deficient number, since it is larger than the sum of its proper divisors (1).

79254809 is an equidigital number, since it uses as much as digits as its factorization.

79254809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 79254809 is about 8902.5170036344. The cubic root of 79254809 is about 429.5448744992.

The spelling of 79254809 in words is "seventy-nine million, two hundred fifty-four thousand, eight hundred nine".