2091543 has 4 divisors (see below), whose sum is σ = 2788728. Its totient is φ = 1394360.

The previous prime is 2091521. The next prime is 2091553. The reversal of 2091543 is 3451902.

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 2091543 - 2¹³ = 2083351 is a prime.

It is a D-number.

2091543 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091503) 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, 348588 + ... + 348593.

It is an arithmetic number, because the mean of its divisors is an integer number (697182).

2^2091543 is an apocalyptic number.

2091543 is a deficient number, since it is larger than the sum of its proper divisors (697185).

2091543 is an equidigital number, since it uses as much as digits as its factorization.

2091543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697184.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 2091543 is about 1446.2167887284. The cubic root of 2091543 is about 127.8857827145.

The spelling of 2091543 in words is "two million, ninety-one thousand, five hundred forty-three".