1212255585 has 16 divisors (see below), whose sum is σ = 2155121280. Its totient is φ = 646536240.

The previous prime is 1212255571. The next prime is 1212255659. The reversal of 1212255585 is 5855522121.

1212255585 is a `hidden beast` number, since 1 + 2 + 1 + 22 + 55 + 585 = 666.

It is not a de Polignac number, because 1212255585 - 2⁶ = 1212255521 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4489701 + ... + 4489970.

It is an arithmetic number, because the mean of its divisors is an integer number (134695080).

Almost surely, 2^1212255585 is an apocalyptic number.

1212255585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1212255585 is a deficient number, since it is larger than the sum of its proper divisors (942865695).

1212255585 is an equidigital number, since it uses as much as digits as its factorization.

1212255585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8979685 (or 8979679 counting only the distinct ones).

The product of its digits is 40000, while the sum is 36.

The square root of 1212255585 is about 34817.4609212102. The cubic root of 1212255585 is about 1066.2639625132.

The spelling of 1212255585 in words is "one billion, two hundred twelve million, two hundred fifty-five thousand, five hundred eighty-five".