15220445209 has 2 divisors, whose sum is σ = 15220445210. Its totient is φ = 15220445208.

The previous prime is 15220445179. The next prime is 15220445243. The reversal of 15220445209 is 90254402251.

It is a happy number.

It is an a-pointer prime, because the next prime (15220445243) can be obtained adding 15220445209 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11269945600 + 3950499609 = 106160^2 + 62853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15220445209 is a prime.

It is not a weakly prime, because it can be changed into another prime (15220445269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610222604 + 7610222605.

It is an arithmetic number, because the mean of its divisors is an integer number (7610222605).

Almost surely, 2^15220445209 is an apocalyptic number.

It is an amenable number.

15220445209 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220445209 is an equidigital number, since it uses as much as digits as its factorization.

15220445209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 15220445209 in words is "fifteen billion, two hundred twenty million, four hundred forty-five thousand, two hundred nine".