2491271 has 4 divisors (see below), whose sum is σ = 2525472. Its totient is φ = 2457072.

The previous prime is 2491259. The next prime is 2491289. The reversal of 2491271 is 1721942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1721942 = 2 ⋅860971.

It is a cyclic number.

It is not a de Polignac number, because 2491271 - 2⁶ = 2491207 is a prime.

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 2491271.

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 3 ways as a sum of consecutive naturals, for example, 16991 + ... + 17136.

It is an arithmetic number, because the mean of its divisors is an integer number (631368).

2^2491271 is an apocalyptic number.

2491271 is a deficient number, since it is larger than the sum of its proper divisors (34201).

2491271 is an equidigital number, since it uses as much as digits as its factorization.

2491271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34200.

The product of its digits is 1008, while the sum is 26.

The square root of 2491271 is about 1578.3760641875. The cubic root of 2491271 is about 135.5627356176.

The spelling of 2491271 in words is "two million, four hundred ninety-one thousand, two hundred seventy-one".