111845727391 has 4 divisors (see below), whose sum is σ = 111857958784. Its totient is φ = 111833496000.

The previous prime is 111845727349. The next prime is 111845727403. The reversal of 111845727391 is 193727548111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193727548111 = 39161 ⋅4946951.

It is a cyclic number.

It is not a de Polignac number, because 111845727391 - 2⁷ = 111845727263 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 (111845727691) 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, 6101970 + ... + 6120271.

It is an arithmetic number, because the mean of its divisors is an integer number (27964489696).

Almost surely, 2^111845727391 is an apocalyptic number.

111845727391 is a deficient number, since it is larger than the sum of its proper divisors (12231393).

111845727391 is an equidigital number, since it uses as much as digits as its factorization.

111845727391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12231392.

The product of its digits is 423360, while the sum is 49.

The spelling of 111845727391 in words is "one hundred eleven billion, eight hundred forty-five million, seven hundred twenty-seven thousand, three hundred ninety-one".