112197991 has 4 divisors (see below), whose sum is σ = 112762000. Its totient is φ = 111633984.

The previous prime is 112197973. The next prime is 112197997. The reversal of 112197991 is 199791211.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-112197991 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 (112197997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281706 + ... + 282103.

It is an arithmetic number, because the mean of its divisors is an integer number (28190500).

Almost surely, 2^112197991 is an apocalyptic number.

112197991 is a deficient number, since it is larger than the sum of its proper divisors (564009).

112197991 is an equidigital number, since it uses as much as digits as its factorization.

112197991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564008.

The product of its digits is 10206, while the sum is 40.

The square root of 112197991 is about 10592.3553093729. The cubic root of 112197991 is about 482.3123251960.

The spelling of 112197991 in words is "one hundred twelve million, one hundred ninety-seven thousand, nine hundred ninety-one".