1220256099 has 12 divisors (see below), whose sum is σ = 1839226896. Its totient is φ = 778134192.

The previous prime is 1220256077. The next prime is 1220256109. The reversal of 1220256099 is 9906520221.

It is a happy number.

1220256099 is a `hidden beast` number, since 1 + 2 + 2 + 0 + 2 + 560 + 99 = 666.

It is not a de Polignac number, because 1220256099 - 2⁸ = 1220255843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220256049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2947272 + ... + 2947685.

It is an arithmetic number, because the mean of its divisors is an integer number (153268908).

Almost surely, 2^1220256099 is an apocalyptic number.

1220256099 is a deficient number, since it is larger than the sum of its proper divisors (618970797).

1220256099 is a wasteful number, since it uses less digits than its factorization.

1220256099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5894986 (or 5894983 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 1220256099 is about 34932.1642472951. The cubic root of 1220256099 is about 1068.6044925122.

The spelling of 1220256099 in words is "one billion, two hundred twenty million, two hundred fifty-six thousand, ninety-nine".