2491855 has 8 divisors (see below), whose sum is σ = 3031632. Its totient is φ = 1965888.

The previous prime is 2491847. The next prime is 2491861. The reversal of 2491855 is 5581942.

2491855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2491855 - 2³ = 2491847 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 2491855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3049 + ... + 3778.

It is an arithmetic number, because the mean of its divisors is an integer number (378954).

2^2491855 is an apocalyptic number.

2491855 is a deficient number, since it is larger than the sum of its proper divisors (539777).

2491855 is an equidigital number, since it uses as much as digits as its factorization.

2491855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905.

The product of its digits is 14400, while the sum is 34.

The square root of 2491855 is about 1578.5610536181. The cubic root of 2491855 is about 135.5733275941.

The spelling of 2491855 in words is "two million, four hundred ninety-one thousand, eight hundred fifty-five".