1216261236 has 12 divisors (see below), whose sum is σ = 2837942912. Its totient is φ = 405420408.

The previous prime is 1216261219. The next prime is 1216261271. The reversal of 1216261236 is 6321626121.

1216261236 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50677540 + ... + 50677563.

Almost surely, 2^1216261236 is an apocalyptic number.

It is an amenable number.

1216261236 is an abundant number, since it is smaller than the sum of its proper divisors (1621681676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216261236 is a wasteful number, since it uses less digits than its factorization.

1216261236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101355110 (or 101355108 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 1216261236 is about 34874.9370752120. The cubic root of 1216261236 is about 1067.4370885086.

Adding to 1216261236 its reverse (6321626121), we get a palindrome (7537887357).

The spelling of 1216261236 in words is "one billion, two hundred sixteen million, two hundred sixty-one thousand, two hundred thirty-six".