1216103256 has 24 divisors (see below), whose sum is σ = 3293613180. Its totient is φ = 405367728.

The previous prime is 1216103243. The next prime is 1216103263. The reversal of 1216103256 is 6523016121.

1216103256 is a `hidden beast` number, since 1 + 21 + 610 + 3 + 25 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8445090 + ... + 8445233.

Almost surely, 2^1216103256 is an apocalyptic number.

It is an amenable number.

1216103256 is an abundant number, since it is smaller than the sum of its proper divisors (2077509924).

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

1216103256 is a wasteful number, since it uses less digits than its factorization.

1216103256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16890335 (or 16890328 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1216103256 is about 34872.6720513356. The cubic root of 1216103256 is about 1067.3908700899.

Adding to 1216103256 its reverse (6523016121), we get a palindrome (7739119377).

The spelling of 1216103256 in words is "one billion, two hundred sixteen million, one hundred three thousand, two hundred fifty-six".