111442631 has 4 divisors (see below), whose sum is σ = 114454632. Its totient is φ = 108430632.

The previous prime is 111442609. The next prime is 111442673. The reversal of 111442631 is 136244111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111442631 is a prime.

It is a super-2 number, since 2×111442631² = 24838920008404322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111442597 and 111442606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111442691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505945 + ... + 1506018.

It is an arithmetic number, because the mean of its divisors is an integer number (28613658).

Almost surely, 2^111442631 is an apocalyptic number.

111442631 is a deficient number, since it is larger than the sum of its proper divisors (3012001).

111442631 is an equidigital number, since it uses as much as digits as its factorization.

111442631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012000.

The product of its digits is 576, while the sum is 23.

The square root of 111442631 is about 10556.6391905758. The cubic root of 111442631 is about 481.2275164399.

Adding to 111442631 its reverse (136244111), we get a palindrome (247686742).

The spelling of 111442631 in words is "one hundred eleven million, four hundred forty-two thousand, six hundred thirty-one".