1216441243 has 2 divisors, whose sum is σ = 1216441244. Its totient is φ = 1216441242.

The previous prime is 1216441217. The next prime is 1216441249. The reversal of 1216441243 is 3421446121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1216441243 - 2⁵ = 1216441211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216441249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608220621 + 608220622.

It is an arithmetic number, because the mean of its divisors is an integer number (608220622).

Almost surely, 2^1216441243 is an apocalyptic number.

1216441243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216441243 is an equidigital number, since it uses as much as digits as its factorization.

1216441243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 1216441243 is about 34877.5177299073. The cubic root of 1216441243 is about 1067.4897462392.

Adding to 1216441243 its reverse (3421446121), we get a palindrome (4637887364).

The spelling of 1216441243 in words is "one billion, two hundred sixteen million, four hundred forty-one thousand, two hundred forty-three".