2161489 has 4 divisors (see below), whose sum is σ = 2358000. Its totient is φ = 1964980.

The previous prime is 2161469. The next prime is 2161493. The reversal of 2161489 is 9841612.

It is a happy number.

2161489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2161489 - 2¹³ = 2153297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161489.

It is not an unprimeable number, because it can be changed into a prime (2161409) 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, 98239 + ... + 98260.

It is an arithmetic number, because the mean of its divisors is an integer number (589500).

2^2161489 is an apocalyptic number.

It is an amenable number.

2161489 is a deficient number, since it is larger than the sum of its proper divisors (196511).

2161489 is a wasteful number, since it uses less digits than its factorization.

2161489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196510.

The product of its digits is 3456, while the sum is 31.

The square root of 2161489 is about 1470.2003264862. The cubic root of 2161489 is about 129.2957778501.

The spelling of 2161489 in words is "two million, one hundred sixty-one thousand, four hundred eighty-nine".