2216591 has 8 divisors (see below), whose sum is σ = 2403744. Its totient is φ = 2031840.

The previous prime is 2216587. The next prime is 2216603. The reversal of 2216591 is 1956122.

2216591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2216591 - 2² = 2216587 is a prime.

It is a super-2 number, since 2×2216591² = 9826551322562, which contains 22 as substring.

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 2216591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216551) 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 7 ways as a sum of consecutive naturals, for example, 1661 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (300468).

2^2216591 is an apocalyptic number.

2216591 is a deficient number, since it is larger than the sum of its proper divisors (187153).

2216591 is a wasteful number, since it uses less digits than its factorization.

2216591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201.

The product of its digits is 1080, while the sum is 26.

The square root of 2216591 is about 1488.8220175696. The cubic root of 2216591 is about 130.3852673521.

Subtracting from 2216591 its sum of digits (26), we obtain a triangular number (2216565 = T₂₁₀₅).

The spelling of 2216591 in words is "two million, two hundred sixteen thousand, five hundred ninety-one".