111820681 has 8 divisors (see below), whose sum is σ = 134521280. Its totient is φ = 90801648.

The previous prime is 111820649. The next prime is 111820699. The reversal of 111820681 is 186028111.

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

It is not a de Polignac number, because 111820681 - 2⁵ = 111820649 is a prime.

It is a super-2 number, since 2×111820681² = 25007729398607522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111820601) 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, 420246 + ... + 420511.

It is an arithmetic number, because the mean of its divisors is an integer number (16815160).

Almost surely, 2^111820681 is an apocalyptic number.

It is an amenable number.

111820681 is a deficient number, since it is larger than the sum of its proper divisors (22700599).

111820681 is an equidigital number, since it uses as much as digits as its factorization.

111820681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840783.

The product of its (nonzero) digits is 768, while the sum is 28.

The square root of 111820681 is about 10574.5298240631. The cubic root of 111820681 is about 481.7710628604.

Adding to 111820681 its reverse (186028111), we get a palindrome (297848792).

The spelling of 111820681 in words is "one hundred eleven million, eight hundred twenty thousand, six hundred eighty-one".