111142681 has 6 divisors (see below), whose sum is σ = 120349950. Its totient is φ = 102593088.

The previous prime is 111142673. The next prime is 111142721. The reversal of 111142681 is 186241111.

It can be written as a sum of positive squares in 3 ways, for example, as 9455625 + 101687056 = 3075^2 + 10084^2 .

It is not a de Polignac number, because 111142681 - 2³ = 111142673 is a prime.

It is a super-2 number, since 2×111142681² = 24705391079735522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111142621) 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 5 ways as a sum of consecutive naturals, for example, 328656 + ... + 328993.

It is an arithmetic number, because the mean of its divisors is an integer number (20058325).

Almost surely, 2^111142681 is an apocalyptic number.

It is an amenable number.

111142681 is a deficient number, since it is larger than the sum of its proper divisors (9207269).

111142681 is an equidigital number, since it uses as much as digits as its factorization.

111142681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657675 (or 657662 counting only the distinct ones).

The product of its digits is 384, while the sum is 25.

The square root of 111142681 is about 10542.4229188550. The cubic root of 111142681 is about 480.7953841162.

Adding to 111142681 its reverse (186241111), we get a palindrome (297383792).

The spelling of 111142681 in words is "one hundred eleven million, one hundred forty-two thousand, six hundred eighty-one".