2116643 has 4 divisors (see below), whose sum is σ = 2119728. Its totient is φ = 2113560.

The previous prime is 2116633. The next prime is 2116651. The reversal of 2116643 is 3466112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2116643 - 2⁴ = 2116627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2116633) 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, 5 + ... + 2057.

It is an arithmetic number, because the mean of its divisors is an integer number (529932).

2^2116643 is an apocalyptic number.

2116643 is a deficient number, since it is larger than the sum of its proper divisors (3085).

2116643 is a wasteful number, since it uses less digits than its factorization.

2116643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084.

The product of its digits is 864, while the sum is 23.

The square root of 2116643 is about 1454.8687226001. The cubic root of 2116643 is about 128.3953232123.

The spelling of 2116643 in words is "two million, one hundred sixteen thousand, six hundred forty-three".