791111111 has 4 divisors (see below), whose sum is σ = 904126992. Its totient is φ = 678095232.

The previous prime is 791111081. The next prime is 791111129. The reversal of 791111111 is 111111197.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 791111111 - 2⁶ = 791111047 is a prime.

It is a Duffinian number.

791111111 is a modest number, since divided by 11111 gives 7911 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791111141) 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, 56507930 + ... + 56507943.

It is an arithmetic number, because the mean of its divisors is an integer number (226031748).

Almost surely, 2^791111111 is an apocalyptic number.

791111111 is a deficient number, since it is larger than the sum of its proper divisors (113015881).

791111111 is a wasteful number, since it uses less digits than its factorization.

791111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113015880.

The product of its digits is 63, while the sum is 23.

The square root of 791111111 is about 28126.6974776635. The cubic root of 791111111 is about 924.8667394099.

The spelling of 791111111 in words is "seven hundred ninety-one million, one hundred eleven thousand, one hundred eleven".