2113643 has 4 divisors (see below), whose sum is σ = 2415600. Its totient is φ = 1811688.

The previous prime is 2113609. The next prime is 2113651. The reversal of 2113643 is 3463112.

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

It is a cyclic number.

It is not a de Polignac number, because 2113643 - 2¹⁴ = 2097259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2113603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150968 + ... + 150981.

It is an arithmetic number, because the mean of its divisors is an integer number (603900).

2^2113643 is an apocalyptic number.

2113643 is a deficient number, since it is larger than the sum of its proper divisors (301957).

2113643 is an equidigital number, since it uses as much as digits as its factorization.

2113643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301956.

The product of its digits is 432, while the sum is 20.

The square root of 2113643 is about 1453.8373361556. The cubic root of 2113643 is about 128.3346346451.

Adding to 2113643 its reverse (3463112), we get a palindrome (5576755).

The spelling of 2113643 in words is "two million, one hundred thirteen thousand, six hundred forty-three".