2221591 has 8 divisors (see below), whose sum is σ = 2308880. Its totient is φ = 2135808.

The previous prime is 2221589. The next prime is 2221631. The reversal of 2221591 is 1951222.

2221591 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 2221591 - 2¹ = 2221589 is a prime.

It is the 1491-st Hogben number.

It is a Duffinian number.

2221591 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221511) by changing a digit.

It is a nontrivial repunit in base 1490.

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, 3280 + ... + 3898.

It is an arithmetic number, because the mean of its divisors is an integer number (288610).

2^2221591 is an apocalyptic number.

2221591 is a deficient number, since it is larger than the sum of its proper divisors (87289).

2221591 is an equidigital number, since it uses as much as digits as its factorization.

2221591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753.

The product of its digits is 360, while the sum is 22.

The square root of 2221591 is about 1490.5002515934. The cubic root of 2221591 is about 130.4832311116.

The spelling of 2221591 in words is "two million, two hundred twenty-one thousand, five hundred ninety-one".