1220609 has 4 divisors (see below), whose sum is σ = 1314516. Its totient is φ = 1126704.

The previous prime is 1220599. The next prime is 1220623. The reversal of 1220609 is 9060221.

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 107584 + 1113025 = 328^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220609 - 2⁸ = 1220353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46934 + ... + 46959.

It is an arithmetic number, because the mean of its divisors is an integer number (328629).

It is a Proth number, since it is equal to 149 ⋅ 2¹³ + 1 and 149 < 2¹³.

2^1220609 is an apocalyptic number.

It is an amenable number.

1220609 is a deficient number, since it is larger than the sum of its proper divisors (93907).

1220609 is an equidigital number, since it uses as much as digits as its factorization.

1220609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93906.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1220609 is about 1104.8117486703. The cubic root of 1220609 is about 106.8707496913.

The spelling of 1220609 in words is "one million, two hundred twenty thousand, six hundred nine".