2591221 has 8 divisors (see below), whose sum is σ = 2708640. Its totient is φ = 2476368.

The previous prime is 2591213. The next prime is 2591233. The reversal of 2591221 is 1221952.

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 2591221 - 2³ = 2591213 is a prime.

It is a Duffinian number.

2591221 is a modest number, since divided by 1221 gives 259 as remainder.

2591221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2591192 and 2591201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1590 + ... + 2776.

It is an arithmetic number, because the mean of its divisors is an integer number (338580).

2^2591221 is an apocalyptic number.

It is an amenable number.

2591221 is a deficient number, since it is larger than the sum of its proper divisors (117419).

2591221 is a wasteful number, since it uses less digits than its factorization.

2591221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283.

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

The square root of 2591221 is about 1609.7269954871. The cubic root of 2591221 is about 137.3519464252.

The spelling of 2591221 in words is "two million, five hundred ninety-one thousand, two hundred twenty-one".