1201609 has 4 divisors (see below), whose sum is σ = 1203840. Its totient is φ = 1199380.

The previous prime is 1201601. The next prime is 1201633. The reversal of 1201609 is 9061021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201609 - 2³ = 1201601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201601) 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, 252 + ... + 1570.

It is an arithmetic number, because the mean of its divisors is an integer number (300960).

2^1201609 is an apocalyptic number.

It is an amenable number.

1201609 is a deficient number, since it is larger than the sum of its proper divisors (2231).

1201609 is an equidigital number, since it uses as much as digits as its factorization.

1201609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1201609 is about 1096.1792736592. The cubic root of 1201609 is about 106.3133306408.

The spelling of 1201609 in words is "one million, two hundred one thousand, six hundred nine".