1223216550 has 144 divisors (see below), whose sum is σ = 3395220192. Its totient is φ = 315532800.

The previous prime is 1223216483. The next prime is 1223216563. The reversal of 1223216550 is 556123221.

It is a happy number.

1223216550 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 2 + 1 + 655 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3080952 + ... + 3081348.

It is an arithmetic number, because the mean of its divisors is an integer number (23577918).

Almost surely, 2^1223216550 is an apocalyptic number.

1223216550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223216550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1697610096).

1223216550 is an abundant number, since it is smaller than the sum of its proper divisors (2172003642).

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

1223216550 is a wasteful number, since it uses less digits than its factorization.

1223216550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1223216550 is about 34974.5128629406. The cubic root of 1223216550 is about 1069.4679714520.

Adding to 1223216550 its reverse (556123221), we get a palindrome (1779339771).

It can be divided in two parts, 12232 and 16550, that added together give a palindrome (28782).

The spelling of 1223216550 in words is "one billion, two hundred twenty-three million, two hundred sixteen thousand, five hundred fifty".