1609321 has 4 divisors (see below), whose sum is σ = 1839232. Its totient is φ = 1379412.

The previous prime is 1609301. The next prime is 1609367. The reversal of 1609321 is 1239061.

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 1609321 - 2⁷ = 1609193 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1609292 and 1609301.

It is not an unprimeable number, because it can be changed into a prime (1609301) 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, 114945 + ... + 114958.

It is an arithmetic number, because the mean of its divisors is an integer number (459808).

2^1609321 is an apocalyptic number.

It is an amenable number.

1609321 is a deficient number, since it is larger than the sum of its proper divisors (229911).

1609321 is an equidigital number, since it uses as much as digits as its factorization.

1609321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229910.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1609321 is about 1268.5901623456. The cubic root of 1609321 is about 117.1873929836.

The spelling of 1609321 in words is "one million, six hundred nine thousand, three hundred twenty-one".