2155543 has 4 divisors (see below), whose sum is σ = 2321368. Its totient is φ = 1989720.

The previous prime is 2155519. The next prime is 2155579. The reversal of 2155543 is 3455512.

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 2155543 - 2⁵ = 2155511 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 (2155513) 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, 82893 + ... + 82918.

It is an arithmetic number, because the mean of its divisors is an integer number (580342).

2^2155543 is an apocalyptic number.

2155543 is a deficient number, since it is larger than the sum of its proper divisors (165825).

2155543 is a wasteful number, since it uses less digits than its factorization.

2155543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165824.

The product of its digits is 3000, while the sum is 25.

The square root of 2155543 is about 1468.1767604754. The cubic root of 2155543 is about 129.1771098505.

The spelling of 2155543 in words is "two million, one hundred fifty-five thousand, five hundred forty-three".