1216441255 has 4 divisors (see below), whose sum is σ = 1459729512. Its totient is φ = 973153000.

The previous prime is 1216441253. The next prime is 1216441297. The reversal of 1216441255 is 5521446121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1216441255 - 2¹ = 1216441253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216441253) 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, 121644121 + ... + 121644130.

It is an arithmetic number, because the mean of its divisors is an integer number (364932378).

Almost surely, 2^1216441255 is an apocalyptic number.

1216441255 is a deficient number, since it is larger than the sum of its proper divisors (243288257).

1216441255 is an equidigital number, since it uses as much as digits as its factorization.

1216441255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243288256.

The product of its digits is 9600, while the sum is 31.

The square root of 1216441255 is about 34877.5179019379. The cubic root of 1216441255 is about 1067.4897497494.

Adding to 1216441255 its reverse (5521446121), we get a palindrome (6737887376).

The spelling of 1216441255 in words is "one billion, two hundred sixteen million, four hundred forty-one thousand, two hundred fifty-five".