2091289 has 4 divisors (see below), whose sum is σ = 2214324. Its totient is φ = 1968256.

The previous prime is 2091283. The next prime is 2091293. The reversal of 2091289 is 9821902.

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 1459264 + 632025 = 1208^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091289 - 2³ = 2091281 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2091289.

It is not an unprimeable number, because it can be changed into a prime (2091281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61492 + ... + 61525.

It is an arithmetic number, because the mean of its divisors is an integer number (553581).

2^2091289 is an apocalyptic number.

It is an amenable number.

2091289 is a deficient number, since it is larger than the sum of its proper divisors (123035).

2091289 is a wasteful number, since it uses less digits than its factorization.

2091289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123034.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 2091289 is about 1446.1289707353. The cubic root of 2091289 is about 127.8806056269.

The spelling of 2091289 in words is "two million, ninety-one thousand, two hundred eighty-nine".