1223245543 has 4 divisors (see below), whose sum is σ = 1317341368. Its totient is φ = 1129149720.

The previous prime is 1223245519. The next prime is 1223245577. The reversal of 1223245543 is 3455423221.

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 1223245543 - 2⁵ = 1223245511 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 (1223245343) 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, 47047893 + ... + 47047918.

It is an arithmetic number, because the mean of its divisors is an integer number (329335342).

Almost surely, 2^1223245543 is an apocalyptic number.

1223245543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1223245543 is a deficient number, since it is larger than the sum of its proper divisors (94095825).

1223245543 is an equidigital number, since it uses as much as digits as its factorization.

1223245543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94095824.

The product of its digits is 28800, while the sum is 31.

The square root of 1223245543 is about 34974.9273480303. The cubic root of 1223245543 is about 1069.4764209888.

Adding to 1223245543 its reverse (3455423221), we get a palindrome (4678668764).

It can be divided in two parts, 12232 and 45543, that added together give a palindrome (57775).

The spelling of 1223245543 in words is "one billion, two hundred twenty-three million, two hundred forty-five thousand, five hundred forty-three".