2891089 has 4 divisors (see below), whose sum is σ = 2896740. Its totient is φ = 2885440.

The previous prime is 2891087. The next prime is 2891093. The reversal of 2891089 is 9801982.

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 435600 + 2455489 = 660^2 + 1567^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891089 - 2¹ = 2891087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2891081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1972 + ... + 3109.

It is an arithmetic number, because the mean of its divisors is an integer number (724185).

2^2891089 is an apocalyptic number.

It is an amenable number.

2891089 is a deficient number, since it is larger than the sum of its proper divisors (5651).

2891089 is an equidigital number, since it uses as much as digits as its factorization.

2891089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 2891089 is about 1700.3202639503. The cubic root of 2891089 is about 142.4581019739.

It can be divided in two parts, 289 and 1089, that multiplied together give a square (314721 = 561²).

The spelling of 2891089 in words is "two million, eight hundred ninety-one thousand, eighty-nine".