1213534443 has 16 divisors (see below), whose sum is σ = 1868973696. Its totient is φ = 692211840.

The previous prime is 1213534429. The next prime is 1213534447. The reversal of 1213534443 is 3444353121.

It is a de Polignac number, because none of the positive numbers 2^k-1213534443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1213534443.

It is not an unprimeable number, because it can be changed into a prime (1213534447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081021 + ... + 1082142.

It is an arithmetic number, because the mean of its divisors is an integer number (116810856).

Almost surely, 2^1213534443 is an apocalyptic number.

1213534443 is a deficient number, since it is larger than the sum of its proper divisors (655439253).

1213534443 is a wasteful number, since it uses less digits than its factorization.

1213534443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163194.

The product of its digits is 17280, while the sum is 30.

The square root of 1213534443 is about 34835.8212620285. The cubic root of 1213534443 is about 1066.6387792297.

Adding to 1213534443 its reverse (3444353121), we get a palindrome (4657887564).

The spelling of 1213534443 in words is "one billion, two hundred thirteen million, five hundred thirty-four thousand, four hundred forty-three".