1331222443 has 4 divisors (see below), whose sum is σ = 1348073440. Its totient is φ = 1314371448.

The previous prime is 1331222437. The next prime is 1331222447. The reversal of 1331222443 is 3442221331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3442221331 = 23 ⋅149661797.

It is a cyclic number.

It is not a de Polignac number, because 1331222443 - 2²⁵ = 1297668011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331222447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8425380 + ... + 8425537.

It is an arithmetic number, because the mean of its divisors is an integer number (337018360).

Almost surely, 2^1331222443 is an apocalyptic number.

1331222443 is a deficient number, since it is larger than the sum of its proper divisors (16850997).

1331222443 is an equidigital number, since it uses as much as digits as its factorization.

1331222443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16850996.

The product of its digits is 3456, while the sum is 25.

The square root of 1331222443 is about 36485.9211614562. The cubic root of 1331222443 is about 1100.0612756499.

Adding to 1331222443 its reverse (3442221331), we get a palindrome (4773443774).

The spelling of 1331222443 in words is "one billion, three hundred thirty-one million, two hundred twenty-two thousand, four hundred forty-three".