1216633271 has 16 divisors (see below), whose sum is σ = 1506472704. Its totient is φ = 958656384.

The previous prime is 1216633247. The next prime is 1216633283. The reversal of 1216633271 is 1723366121.

It is not a de Polignac number, because 1216633271 - 2²⁶ = 1149524407 is a prime.

It is a super-2 number, since 2×1216633271² = 2960393032208318882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216633241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113765 + ... + 123998.

It is an arithmetic number, because the mean of its divisors is an integer number (94154544).

Almost surely, 2^1216633271 is an apocalyptic number.

1216633271 is a deficient number, since it is larger than the sum of its proper divisors (289839433).

1216633271 is a wasteful number, since it uses less digits than its factorization.

1216633271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237830.

The product of its digits is 9072, while the sum is 32.

The square root of 1216633271 is about 34880.2705121391. The cubic root of 1216633271 is about 1067.5459147654.

Adding to 1216633271 its reverse (1723366121), we get a palindrome (2939999392).

The spelling of 1216633271 in words is "one billion, two hundred sixteen million, six hundred thirty-three thousand, two hundred seventy-one".