2491221 has 8 divisors (see below), whose sum is σ = 3328960. Its totient is φ = 1657152.

The previous prime is 2491211. The next prime is 2491243. The reversal of 2491221 is 1221942.

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

It is not a de Polignac number, because 2491221 - 2⁵ = 2491189 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 (2491211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1965 + ... + 2973.

It is an arithmetic number, because the mean of its divisors is an integer number (416120).

2^2491221 is an apocalyptic number.

It is an amenable number.

2491221 is a deficient number, since it is larger than the sum of its proper divisors (837739).

2491221 is a wasteful number, since it uses less digits than its factorization.

2491221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835.

The product of its digits is 288, while the sum is 21.

The square root of 2491221 is about 1578.3602250437. The cubic root of 2491221 is about 135.5618286933.

The spelling of 2491221 in words is "two million, four hundred ninety-one thousand, two hundred twenty-one".