15220609 has 2 divisors, whose sum is σ = 15220610. Its totient is φ = 15220608.

The previous prime is 15220607. The next prime is 15220613. The reversal of 15220609 is 90602251.

15220609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 10609 = 3900^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 15220609 - 2¹ = 15220607 is a prime.

Together with 15220607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15220603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7610304 + 7610305.

It is an arithmetic number, because the mean of its divisors is an integer number (7610305).

Almost surely, 2^15220609 is an apocalyptic number.

It is an amenable number.

15220609 is a deficient number, since it is larger than the sum of its proper divisors (1).

15220609 is an equidigital number, since it uses as much as digits as its factorization.

15220609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 15220609 is about 3901.3598911149. The cubic root of 15220609 is about 247.8243694498.

The spelling of 15220609 in words is "fifteen million, two hundred twenty thousand, six hundred nine".