112991681 has 8 divisors (see below), whose sum is σ = 125104224. Its totient is φ = 101185920.

The previous prime is 112991677. The next prime is 112991693. The reversal of 112991681 is 186199211.

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

It is not a de Polignac number, because 112991681 - 2² = 112991677 is a prime.

It is a super-2 number, since 2×112991681² = 25534239950411522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (112991611) 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, 75920 + ... + 77393.

It is an arithmetic number, because the mean of its divisors is an integer number (15638028).

Almost surely, 2^112991681 is an apocalyptic number.

112991681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

112991681 is a deficient number, since it is larger than the sum of its proper divisors (12112543).

112991681 is a wasteful number, since it uses less digits than its factorization.

112991681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153391.

The product of its digits is 7776, while the sum is 38.

The square root of 112991681 is about 10629.7545126875. The cubic root of 112991681 is about 483.4469484263.

The spelling of 112991681 in words is "one hundred twelve million, nine hundred ninety-one thousand, six hundred eighty-one".