1216253311 has 16 divisors (see below), whose sum is σ = 1500212224. Its totient is φ = 960198624.

The previous prime is 1216253299. The next prime is 1216253371. The reversal of 1216253311 is 1133526121.

It is a happy number.

It is not a de Polignac number, because 1216253311 - 2⁵ = 1216253279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216253371) 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 15 ways as a sum of consecutive naturals, for example, 27700 + ... + 56566.

It is an arithmetic number, because the mean of its divisors is an integer number (93763264).

Almost surely, 2^1216253311 is an apocalyptic number.

1216253311 is a deficient number, since it is larger than the sum of its proper divisors (283958913).

1216253311 is a wasteful number, since it uses less digits than its factorization.

1216253311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29350.

The product of its digits is 1080, while the sum is 25.

The square root of 1216253311 is about 34874.8234547503. The cubic root of 1216253311 is about 1067.4347700765.

Adding to 1216253311 its reverse (1133526121), we get a palindrome (2349779432).

The spelling of 1216253311 in words is "one billion, two hundred sixteen million, two hundred fifty-three thousand, three hundred eleven".