1216865050 has 12 divisors (see below), whose sum is σ = 2263369086. Its totient is φ = 486746000.

The previous prime is 1216865033. The next prime is 1216865093. The reversal of 1216865050 is 505686121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1002798889 + 214066161 = 31667^2 + 14631^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1216864997 and 1216865015.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12168601 + ... + 12168700.

Almost surely, 2^1216865050 is an apocalyptic number.

1216865050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216865050 is a deficient number, since it is larger than the sum of its proper divisors (1046504036).

1216865050 is a wasteful number, since it uses less digits than its factorization.

1216865050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24337313 (or 24337308 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 1216865050 is about 34883.5928482145. The cubic root of 1216865050 is about 1067.6137026571.

It can be divided in two parts, 121686 and 5050, that added together give a square (126736 = 356²).

The spelling of 1216865050 in words is "one billion, two hundred sixteen million, eight hundred sixty-five thousand, fifty".