2491799 has 4 divisors (see below), whose sum is σ = 2544864. Its totient is φ = 2438736.

The previous prime is 2491787. The next prime is 2491813. The reversal of 2491799 is 9971942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9971942 = 2 ⋅4985971.

It is not a de Polignac number, because 2491799 - 2²⁰ = 1443223 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 (2491729) 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, 26462 + ... + 26555.

It is an arithmetic number, because the mean of its divisors is an integer number (636216).

2^2491799 is an apocalyptic number.

2491799 is a deficient number, since it is larger than the sum of its proper divisors (53065).

2491799 is an equidigital number, since it uses as much as digits as its factorization.

2491799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53064.

The product of its digits is 40824, while the sum is 41.

The square root of 2491799 is about 1578.5433158453. The cubic root of 2491799 is about 135.5723119969.

It can be divided in two parts, 249 and 1799, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 2491799 in words is "two million, four hundred ninety-one thousand, seven hundred ninety-nine".