111423561 has 8 divisors (see below), whose sum is σ = 148648704. Its totient is φ = 74240400.

The previous prime is 111423553. The next prime is 111423563. The reversal of 111423561 is 165324111.

It is a happy number.

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

It is not a de Polignac number, because 111423561 - 2³ = 111423553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111423563) 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, 3666 + ... + 15371.

It is an arithmetic number, because the mean of its divisors is an integer number (18581088).

Almost surely, 2^111423561 is an apocalyptic number.

It is an amenable number.

111423561 is a deficient number, since it is larger than the sum of its proper divisors (37225143).

111423561 is a wasteful number, since it uses less digits than its factorization.

111423561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20991.

The product of its digits is 720, while the sum is 24.

The square root of 111423561 is about 10555.7359288682. The cubic root of 111423561 is about 481.2000657472.

Adding to 111423561 its reverse (165324111), we get a palindrome (276747672).

The spelling of 111423561 in words is "one hundred eleven million, four hundred twenty-three thousand, five hundred sixty-one".