2911289 has 4 divisors (see below), whose sum is σ = 2915556. Its totient is φ = 2907024.

The previous prime is 2911247. The next prime is 2911291. The reversal of 2911289 is 9821192.

It is a happy number.

2911289 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1459264 + 1452025 = 1208^2 + 1205^2 .

It is not a de Polignac number, because 2911289 - 2¹² = 2907193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2911189) 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, 854 + ... + 2559.

It is an arithmetic number, because the mean of its divisors is an integer number (728889).

2^2911289 is an apocalyptic number.

It is an amenable number.

2911289 is a deficient number, since it is larger than the sum of its proper divisors (4267).

2911289 is an equidigital number, since it uses as much as digits as its factorization.

2911289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266.

The product of its digits is 2592, while the sum is 32.

The square root of 2911289 is about 1706.2499816850. The cubic root of 2911289 is about 142.7891165168.

Subtracting 2911289 from its reverse (9821192), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2911289 in words is "two million, nine hundred eleven thousand, two hundred eighty-nine".