1216225606 has 36 divisors (see below), whose sum is σ = 1995088212. Its totient is φ = 555963408.

The previous prime is 1216225603. The next prime is 1216225639. The reversal of 1216225606 is 6065226121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216225601) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 606201 + ... + 608203.

It is an arithmetic number, because the mean of its divisors is an integer number (55419117).

Almost surely, 2^1216225606 is an apocalyptic number.

1216225606 is a deficient number, since it is larger than the sum of its proper divisors (778862606).

1216225606 is a wasteful number, since it uses less digits than its factorization.

1216225606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101 (or 2053 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1216225606 is about 34874.4262461764. The cubic root of 1216225606 is about 1067.4266649927.

The spelling of 1216225606 in words is "one billion, two hundred sixteen million, two hundred twenty-five thousand, six hundred six".