2143591 has 4 divisors (see below), whose sum is σ = 2152800. Its totient is φ = 2134384.

The previous prime is 2143579. The next prime is 2143621. The reversal of 2143591 is 1953412.

2143591 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 2143591 - 2¹¹ = 2141543 is a prime.

It is a Duffinian number.

2143591 is a lucky number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143501) 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, 4246 + ... + 4723.

It is an arithmetic number, because the mean of its divisors is an integer number (538200).

2^2143591 is an apocalyptic number.

2143591 is a deficient number, since it is larger than the sum of its proper divisors (9209).

2143591 is an equidigital number, since it uses as much as digits as its factorization.

2143591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9208.

The product of its digits is 1080, while the sum is 25.

The square root of 2143591 is about 1464.1007478995. The cubic root of 2143591 is about 128.9379145586.

The spelling of 2143591 in words is "two million, one hundred forty-three thousand, five hundred ninety-one".