112345991 has 4 divisors (see below), whose sum is σ = 112373184. Its totient is φ = 112318800.

The previous prime is 112345969. The next prime is 112345997. The reversal of 112345991 is 199543211.

It is a happy number.

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 112345991 - 2¹⁸ = 112083847 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 (112345997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5975 + ... + 16136.

It is an arithmetic number, because the mean of its divisors is an integer number (28093296).

Almost surely, 2^112345991 is an apocalyptic number.

112345991 is a deficient number, since it is larger than the sum of its proper divisors (27193).

112345991 is an equidigital number, since it uses as much as digits as its factorization.

112345991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27192.

The product of its digits is 9720, while the sum is 35.

The square root of 112345991 is about 10599.3391775148. The cubic root of 112345991 is about 482.5243042157.

The spelling of 112345991 in words is "one hundred twelve million, three hundred forty-five thousand, nine hundred ninety-one".