79855909 has 4 divisors (see below), whose sum is σ = 91263904. Its totient is φ = 68447916.

The previous prime is 79855903. The next prime is 79855913. The reversal of 79855909 is 90955897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90955897 = 53 ⋅1716149.

It is a cyclic number.

It is not a de Polignac number, because 79855909 - 2¹³ = 79847717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79855903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5703987 + ... + 5704000.

It is an arithmetic number, because the mean of its divisors is an integer number (22815976).

Almost surely, 2^79855909 is an apocalyptic number.

It is an amenable number.

79855909 is a deficient number, since it is larger than the sum of its proper divisors (11407995).

79855909 is a wasteful number, since it uses less digits than its factorization.

79855909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11407994.

The product of its (nonzero) digits is 1020600, while the sum is 52.

The square root of 79855909 is about 8936.2133479455. The cubic root of 79855909 is about 430.6280869946.

The spelling of 79855909 in words is "seventy-nine million, eight hundred fifty-five thousand, nine hundred nine".