1001609 has 6 divisors (see below), whose sum is σ = 1165194. Its totient is φ = 858480.

The previous prime is 1001593. The next prime is 1001621. The reversal of 1001609 is 9061001.

It can be written as a sum of positive squares in only one way, i.e., 960400 + 41209 = 980^2 + 203^2 .

It is not a de Polignac number, because 1001609 - 2⁴ = 1001593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10172 + ... + 10269.

It is an arithmetic number, because the mean of its divisors is an integer number (194199).

2^1001609 is an apocalyptic number.

It is an amenable number.

1001609 is a deficient number, since it is larger than the sum of its proper divisors (163585).

1001609 is an equidigital number, since it uses as much as digits as its factorization.

1001609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20455 (or 20448 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 1001609 is about 1000.8041766500. The cubic root of 1001609 is about 100.0536045937.

The spelling of 1001609 in words is "one million, one thousand, six hundred nine".