2131543 has 4 divisors (see below), whose sum is σ = 2135848. Its totient is φ = 2127240.

The previous prime is 2131541. The next prime is 2131559. The reversal of 2131543 is 3451312.

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 2131543 - 2¹ = 2131541 is a prime.

It is a d-powerful number, because it can be written as 2 + 1 + 3⁵ + 1 + 5⁹ + 4⁵ + 3¹¹ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2131543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131541) 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, 1296 + ... + 2437.

It is an arithmetic number, because the mean of its divisors is an integer number (533962).

2^2131543 is an apocalyptic number.

2131543 is a deficient number, since it is larger than the sum of its proper divisors (4305).

2131543 is an equidigital number, since it uses as much as digits as its factorization.

2131543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304.

The product of its digits is 360, while the sum is 19.

The square root of 2131543 is about 1459.9804793216. The cubic root of 2131543 is about 128.6958964558.

Adding to 2131543 its reverse (3451312), we get a palindrome (5582855).

The spelling of 2131543 in words is "two million, one hundred thirty-one thousand, five hundred forty-three".