1216063261 has 16 divisors (see below), whose sum is σ = 1473220224. Its totient is φ = 979905024.

The previous prime is 1216063241. The next prime is 1216063267. The reversal of 1216063261 is 1623606121.

It is not a de Polignac number, because 1216063261 - 2⁵ = 1216063229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216063267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108046 + ... + 118768.

It is an arithmetic number, because the mean of its divisors is an integer number (92076264).

Almost surely, 2^1216063261 is an apocalyptic number.

It is an amenable number.

1216063261 is a deficient number, since it is larger than the sum of its proper divisors (257156963).

1216063261 is a wasteful number, since it uses less digits than its factorization.

1216063261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11700.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1216063261 is about 34872.0986033247. The cubic root of 1216063261 is about 1067.3791685710.

Adding to 1216063261 its reverse (1623606121), we get a palindrome (2839669382).

The spelling of 1216063261 in words is "one billion, two hundred sixteen million, sixty-three thousand, two hundred sixty-one".