2291689 has 4 divisors (see below), whose sum is σ = 2323156. Its totient is φ = 2260224.

The previous prime is 2291683. The next prime is 2291699. The reversal of 2291689 is 9861922.

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 1937664 + 354025 = 1392^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 2291689 - 2⁵ = 2291657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2291683) 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, 15624 + ... + 15769.

It is an arithmetic number, because the mean of its divisors is an integer number (580789).

2^2291689 is an apocalyptic number.

It is an amenable number.

2291689 is a deficient number, since it is larger than the sum of its proper divisors (31467).

2291689 is an equidigital number, since it uses as much as digits as its factorization.

2291689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31466.

The product of its digits is 15552, while the sum is 37.

The square root of 2291689 is about 1513.8325534880. The cubic root of 2291689 is about 131.8414265065.

It can be divided in two parts, 22916 and 89, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 2291689 in words is "two million, two hundred ninety-one thousand, six hundred eighty-nine".