1220143543 has 4 divisors (see below), whose sum is σ = 1220787288. Its totient is φ = 1219499800.

The previous prime is 1220143531. The next prime is 1220143607. The reversal of 1220143543 is 3453410221.

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 1220143543 - 2²⁹ = 683272631 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 (1220143513) 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, 319021 + ... + 322822.

It is an arithmetic number, because the mean of its divisors is an integer number (305196822).

Almost surely, 2^1220143543 is an apocalyptic number.

1220143543 is a deficient number, since it is larger than the sum of its proper divisors (643745).

1220143543 is an equidigital number, since it uses as much as digits as its factorization.

1220143543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643744.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1220143543 is about 34930.5531447757. The cubic root of 1220143543 is about 1068.5716355991.

Adding to 1220143543 its reverse (3453410221), we get a palindrome (4673553764).

The spelling of 1220143543 in words is "one billion, two hundred twenty million, one hundred forty-three thousand, five hundred forty-three".