79111111 has 4 divisors (see below), whose sum is σ = 80225424. Its totient is φ = 77996800.

The previous prime is 79111051. The next prime is 79111141. The reversal of 79111111 is 11111197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11111197 = 1619 ⋅6863.

It is a cyclic number.

It is not a de Polignac number, because 79111111 - 2¹⁵ = 79078343 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

79111111 is a modest number, since divided by 11111 gives 791 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79111141) 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, 557050 + ... + 557191.

It is an arithmetic number, because the mean of its divisors is an integer number (20056356).

Almost surely, 2^79111111 is an apocalyptic number.

79111111 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

79111111 is a deficient number, since it is larger than the sum of its proper divisors (1114313).

79111111 is a wasteful number, since it uses less digits than its factorization.

79111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114312.

The product of its digits is 63, while the sum is 22.

The square root of 79111111 is about 8894.4427031715. The cubic root of 79111111 is about 429.2851128416.

The spelling of 79111111 in words is "seventy-nine million, one hundred eleven thousand, one hundred eleven".