1601189 has 4 divisors (see below), whose sum is σ = 1627500. Its totient is φ = 1574880.

The previous prime is 1601161. The next prime is 1601203. The reversal of 1601189 is 9811061.

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 550564 + 1050625 = 742^2 + 1025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13064 + ... + 13185.

It is an arithmetic number, because the mean of its divisors is an integer number (406875).

2^1601189 is an apocalyptic number.

It is an amenable number.

1601189 is a deficient number, since it is larger than the sum of its proper divisors (26311).

1601189 is an equidigital number, since it uses as much as digits as its factorization.

1601189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26310.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1601189 is about 1265.3809703010. The cubic root of 1601189 is about 116.9896744973.

The spelling of 1601189 in words is "one million, six hundred one thousand, one hundred eighty-nine".