2543321243 has 4 divisors (see below), whose sum is σ = 2543918520. Its totient is φ = 2542723968.

The previous prime is 2543321219. The next prime is 2543321269. The reversal of 2543321243 is 3421233452.

It is a happy number.

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 2543321243 - 2⁸ = 2543320987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543321213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292205 + ... + 300782.

It is an arithmetic number, because the mean of its divisors is an integer number (635979630).

Almost surely, 2^2543321243 is an apocalyptic number.

2543321243 is a deficient number, since it is larger than the sum of its proper divisors (597277).

2543321243 is an equidigital number, since it uses as much as digits as its factorization.

2543321243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 597276.

The product of its digits is 17280, while the sum is 29.

The square root of 2543321243 is about 50431.3517863640. The cubic root of 2543321243 is about 1365.0034202261.

Adding to 2543321243 its reverse (3421233452), we get a palindrome (5964554695).

The spelling of 2543321243 in words is "two billion, five hundred forty-three million, three hundred twenty-one thousand, two hundred forty-three".