1220551209 has 12 divisors (see below), whose sum is σ = 1769527552. Its totient is φ = 810696600.

The previous prime is 1220551201. The next prime is 1220551219. The reversal of 1220551209 is 9021550221.

It is not a de Polignac number, because 1220551209 - 2³ = 1220551201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220551201) 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, 247777 + ... + 252654.

Almost surely, 2^1220551209 is an apocalyptic number.

It is an amenable number.

1220551209 is a deficient number, since it is larger than the sum of its proper divisors (548976343).

1220551209 is a wasteful number, since it uses less digits than its factorization.

1220551209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500708 (or 500705 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1220551209 is about 34936.3880359719. The cubic root of 1220551209 is about 1068.6906302919.

The spelling of 1220551209 in words is "one billion, two hundred twenty million, five hundred fifty-one thousand, two hundred nine".