2491005 has 32 divisors (see below), whose sum is σ = 4497408. Its totient is φ = 1166400.

The previous prime is 2491001. The next prime is 2491007. The reversal of 2491005 is 5001942.

It is not a de Polignac number, because 2491005 - 2² = 2491001 is a prime.

It is a Curzon number.

2491005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4872 + ... + 5358.

It is an arithmetic number, because the mean of its divisors is an integer number (140544).

2^2491005 is an apocalyptic number.

It is an amenable number.

2491005 is a deficient number, since it is larger than the sum of its proper divisors (2006403).

2491005 is a wasteful number, since it uses less digits than its factorization.

2491005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2491005 is about 1578.2917981159. The cubic root of 2491005 is about 135.5579106412.

Adding to 2491005 its reverse (5001942), we get a palindrome (7492947).

The spelling of 2491005 in words is "two million, four hundred ninety-one thousand, five".