111405623 has 4 divisors (see below), whose sum is σ = 127320720. Its totient is φ = 95490528.

The previous prime is 111405611. The next prime is 111405649. The reversal of 111405623 is 326504111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326504111 = 173 ⋅1887307.

It is not a de Polignac number, because 111405623 - 2⁸ = 111405367 is a prime.

It is a super-2 number, since 2×111405623² = 24822425672036258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111405653) 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, 7957538 + ... + 7957551.

It is an arithmetic number, because the mean of its divisors is an integer number (31830180).

Almost surely, 2^111405623 is an apocalyptic number.

111405623 is a deficient number, since it is larger than the sum of its proper divisors (15915097).

111405623 is an equidigital number, since it uses as much as digits as its factorization.

111405623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15915096.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 111405623 is about 10554.8862144506. The cubic root of 111405623 is about 481.1742416757.

Adding to 111405623 its reverse (326504111), we get a palindrome (437909734).

The spelling of 111405623 in words is "one hundred eleven million, four hundred five thousand, six hundred twenty-three".