2491109 has 4 divisors (see below), whose sum is σ = 2622240. Its totient is φ = 2359980.

The previous prime is 2491091. The next prime is 2491117. The reversal of 2491109 is 9011942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2491109 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 (2491189) 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, 65537 + ... + 65574.

It is an arithmetic number, because the mean of its divisors is an integer number (655560).

2^2491109 is an apocalyptic number.

It is an amenable number.

2491109 is a deficient number, since it is larger than the sum of its proper divisors (131131).

2491109 is a wasteful number, since it uses less digits than its factorization.

2491109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131130.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 2491109 is about 1578.3247447848. The cubic root of 2491109 is about 135.5597971390.

The spelling of 2491109 in words is "two million, four hundred ninety-one thousand, one hundred nine".