111113781 has 8 divisors (see below), whose sum is σ = 151304064. Its totient is φ = 72499680.

The previous prime is 111113749. The next prime is 111113789. The reversal of 111113781 is 187311111.

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

It is not a de Polignac number, because 111113781 - 2⁵ = 111113749 is a prime.

It is a super-2 number, since 2×111113781² = 24692544656231922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111113789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393880 + ... + 394161.

It is an arithmetic number, because the mean of its divisors is an integer number (18913008).

Almost surely, 2^111113781 is an apocalyptic number.

It is an amenable number.

111113781 is a deficient number, since it is larger than the sum of its proper divisors (40190283).

111113781 is an equidigital number, since it uses as much as digits as its factorization.

111113781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788091.

The product of its digits is 168, while the sum is 24.

The square root of 111113781 is about 10541.0521770837. The cubic root of 111113781 is about 480.7537073844.

Adding to 111113781 its reverse (187311111), we get a palindrome (298424892).

The spelling of 111113781 in words is "one hundred eleven million, one hundred thirteen thousand, seven hundred eighty-one".