111881 has 8 divisors (see below), whose sum is σ = 139584. Its totient is φ = 87120.

The previous prime is 111871. The next prime is 111893. The reversal of 111881 is 188111.

111881 = 4² + 5² + ... + 69².

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

It is a de Polignac number, because none of the positive numbers 2^k-111881 is a prime.

It is a super-2 number, since 2×111881² = 25034716322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111821) 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, 650 + ... + 803.

It is an arithmetic number, because the mean of its divisors is an integer number (17448).

2¹¹¹⁸⁸¹ is an apocalyptic number.

111881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111881 is a deficient number, since it is larger than the sum of its proper divisors (27703).

111881 is a wasteful number, since it uses less digits than its factorization.

111881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471.

The product of its digits is 64, while the sum is 20.

The square root of 111881 is about 334.4861731073. The cubic root of 111881 is about 48.1857673926.

Adding to 111881 its reverse (188111), we get a palindrome (299992).

The spelling of 111881 in words is "one hundred eleven thousand, eight hundred eighty-one".