1220445305 has 4 divisors (see below), whose sum is σ = 1464534372. Its totient is φ = 976356240.

The previous prime is 1220445301. The next prime is 1220445323. The reversal of 1220445305 is 5035440221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 904565776 + 315879529 = 30076^2 + 17773^2 .

It is not a de Polignac number, because 1220445305 - 2² = 1220445301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220445301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122044526 + ... + 122044535.

It is an arithmetic number, because the mean of its divisors is an integer number (366133593).

Almost surely, 2^1220445305 is an apocalyptic number.

It is an amenable number.

1220445305 is a deficient number, since it is larger than the sum of its proper divisors (244089067).

1220445305 is an equidigital number, since it uses as much as digits as its factorization.

1220445305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244089066.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 1220445305 is about 34934.8723341019. The cubic root of 1220445305 is about 1068.6597202448.

Adding to 1220445305 its reverse (5035440221), we get a palindrome (6255885526).

The spelling of 1220445305 in words is "one billion, two hundred twenty million, four hundred forty-five thousand, three hundred five".