1220543109 has 24 divisors (see below), whose sum is σ = 1857433760. Its totient is φ = 770189472.

The previous prime is 1220543057. The next prime is 1220543111. The reversal of 1220543109 is 9013450221.

1220543109 is a `hidden beast` number, since 1 + 220 + 5 + 431 + 0 + 9 = 666.

It is not a de Polignac number, because 1220543109 - 2⁹ = 1220542597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220543209) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251187 + ... + 255999.

Almost surely, 2^1220543109 is an apocalyptic number.

1220543109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1220543109 is a deficient number, since it is larger than the sum of its proper divisors (636890651).

1220543109 is a wasteful number, since it uses less digits than its factorization.

1220543109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6321 (or 6318 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1220543109 is about 34936.2721108020. The cubic root of 1220543109 is about 1068.6882662197.

The spelling of 1220543109 in words is "one billion, two hundred twenty million, five hundred forty-three thousand, one hundred nine".