1220541109 has 2 divisors, whose sum is σ = 1220541110. Its totient is φ = 1220541108.

The previous prime is 1220541107. The next prime is 1220541143. The reversal of 1220541109 is 9011450221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1056445009 + 164096100 = 32503^2 + 12810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220541109 - 2¹ = 1220541107 is a prime.

Together with 1220541107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220541103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610270554 + 610270555.

It is an arithmetic number, because the mean of its divisors is an integer number (610270555).

Almost surely, 2^1220541109 is an apocalyptic number.

It is an amenable number.

1220541109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220541109 is an equidigital number, since it uses as much as digits as its factorization.

1220541109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1220541109 is about 34936.2434872440. The cubic root of 1220541109 is about 1068.6876824966.

The spelling of 1220541109 in words is "one billion, two hundred twenty million, five hundred forty-one thousand, one hundred nine".