2117543 has 4 divisors (see below), whose sum is σ = 2137080. Its totient is φ = 2098008.

The previous prime is 2117539. The next prime is 2117561. The reversal of 2117543 is 3457112.

2117543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2117543 - 2² = 2117539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9605 + ... + 9822.

It is an arithmetic number, because the mean of its divisors is an integer number (534270).

2^2117543 is an apocalyptic number.

2117543 is a deficient number, since it is larger than the sum of its proper divisors (19537).

2117543 is a wasteful number, since it uses less digits than its factorization.

2117543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19536.

The product of its digits is 840, while the sum is 23.

The square root of 2117543 is about 1455.1779959854. The cubic root of 2117543 is about 128.4135185994.

The spelling of 2117543 in words is "two million, one hundred seventeen thousand, five hundred forty-three".