1243222543 has 4 divisors (see below), whose sum is σ = 1283326528. Its totient is φ = 1203118560.

The previous prime is 1243222531. The next prime is 1243222549. The reversal of 1243222543 is 3452223421.

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 1243222543 - 2⁵ = 1243222511 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 (1243222549) 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, 20051946 + ... + 20052007.

It is an arithmetic number, because the mean of its divisors is an integer number (320831632).

Almost surely, 2^1243222543 is an apocalyptic number.

1243222543 is a deficient number, since it is larger than the sum of its proper divisors (40103985).

1243222543 is an equidigital number, since it uses as much as digits as its factorization.

1243222543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40103984.

The product of its digits is 11520, while the sum is 28.

The square root of 1243222543 is about 35259.3610690835. The cubic root of 1243222543 is about 1075.2669372798.

Adding to 1243222543 its reverse (3452223421), we get a palindrome (4695445964).

The spelling of 1243222543 in words is "one billion, two hundred forty-three million, two hundred twenty-two thousand, five hundred forty-three".