1216341443 has 4 divisors (see below), whose sum is σ = 1217054880. Its totient is φ = 1215628008.

The previous prime is 1216341397. The next prime is 1216341457. The reversal of 1216341443 is 3441436121.

It is a happy number.

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 1216341443 - 2⁸ = 1216341187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216341493) 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, 354155 + ... + 357572.

It is an arithmetic number, because the mean of its divisors is an integer number (304263720).

Almost surely, 2^1216341443 is an apocalyptic number.

1216341443 is a deficient number, since it is larger than the sum of its proper divisors (713437).

1216341443 is an equidigital number, since it uses as much as digits as its factorization.

1216341443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713436.

The product of its digits is 6912, while the sum is 29.

The square root of 1216341443 is about 34876.0869794764. The cubic root of 1216341443 is about 1067.4605522300.

Adding to 1216341443 its reverse (3441436121), we get a palindrome (4657777564).

The spelling of 1216341443 in words is "one billion, two hundred sixteen million, three hundred forty-one thousand, four hundred forty-three".