1131220443 has 8 divisors (see below), whose sum is σ = 1597017168. Its totient is φ = 709785344.

The previous prime is 1131220397. The next prime is 1131220457. The reversal of 1131220443 is 3440221311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131220443 - 2⁹ = 1131219931 is a prime.

It is a super-2 number, since 2×1131220443² = 2559319381322232498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131240443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11090346 + ... + 11090447.

It is an arithmetic number, because the mean of its divisors is an integer number (199627146).

Almost surely, 2^1131220443 is an apocalyptic number.

1131220443 is a deficient number, since it is larger than the sum of its proper divisors (465796725).

1131220443 is a wasteful number, since it uses less digits than its factorization.

1131220443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22180813.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1131220443 is about 33633.6207239126. The cubic root of 1131220443 is about 1041.9552845584.

Adding to 1131220443 its reverse (3440221311), we get a palindrome (4571441754).

The spelling of 1131220443 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, four hundred forty-three".