2111623 has 4 divisors (see below), whose sum is σ = 2163168. Its totient is φ = 2060080.

The previous prime is 2111597. The next prime is 2111633. The reversal of 2111623 is 3261112.

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-2111623 is a prime.

It is a Duffinian number.

2111623 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2111597 and 2111606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111633) 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, 25711 + ... + 25792.

It is an arithmetic number, because the mean of its divisors is an integer number (540792).

2^2111623 is an apocalyptic number.

2111623 is a deficient number, since it is larger than the sum of its proper divisors (51545).

2111623 is an equidigital number, since it uses as much as digits as its factorization.

2111623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51544.

The product of its digits is 72, while the sum is 16.

The square root of 2111623 is about 1453.1424568844. The cubic root of 2111623 is about 128.2937386518.

Adding to 2111623 its reverse (3261112), we get a palindrome (5372735).

The spelling of 2111623 in words is "two million, one hundred eleven thousand, six hundred twenty-three".