111711391 has 8 divisors (see below), whose sum is σ = 127165824. Its totient is φ = 97140120.

The previous prime is 111711373. The next prime is 111711401. The reversal of 111711391 is 193117111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111711391 - 2⁷ = 111711263 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 (111711361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220521 + ... + 221026.

It is an arithmetic number, because the mean of its divisors is an integer number (15895728).

Almost surely, 2^111711391 is an apocalyptic number.

111711391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111711391 is a deficient number, since it is larger than the sum of its proper divisors (15454433).

111711391 is a wasteful number, since it uses less digits than its factorization.

111711391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441581.

The product of its digits is 189, while the sum is 25.

The square root of 111711391 is about 10569.3609551382. The cubic root of 111711391 is about 481.6140557605.

The spelling of 111711391 in words is "one hundred eleven million, seven hundred eleven thousand, three hundred ninety-one".