111842391 has 4 divisors (see below), whose sum is σ = 149123192. Its totient is φ = 74561592.

The previous prime is 111842377. The next prime is 111842411. The reversal of 111842391 is 193248111.

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

It is not a de Polignac number, because 111842391 - 2¹³ = 111834199 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 (111842191) 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, 18640396 + ... + 18640401.

It is an arithmetic number, because the mean of its divisors is an integer number (37280798).

Almost surely, 2^111842391 is an apocalyptic number.

111842391 is a deficient number, since it is larger than the sum of its proper divisors (37280801).

111842391 is an equidigital number, since it uses as much as digits as its factorization.

111842391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37280800.

The product of its digits is 1728, while the sum is 30.

The square root of 111842391 is about 10575.5562974247. The cubic root of 111842391 is about 481.8022394814.

The spelling of 111842391 in words is "one hundred eleven million, eight hundred forty-two thousand, three hundred ninety-one".