2491897 has 4 divisors (see below), whose sum is σ = 2523520. Its totient is φ = 2460276.

The previous prime is 2491891. The next prime is 2491903. The reversal of 2491897 is 7981942.

2491897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an interprime number because it is at equal distance from previous prime (2491891) and next prime (2491903).

It is a cyclic number.

It is not a de Polignac number, because 2491897 - 2¹¹ = 2489849 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 (2491891) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15693 + ... + 15850.

It is an arithmetic number, because the mean of its divisors is an integer number (630880).

2^2491897 is an apocalyptic number.

It is an amenable number.

2491897 is a deficient number, since it is larger than the sum of its proper divisors (31623).

2491897 is an equidigital number, since it uses as much as digits as its factorization.

2491897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31622.

The product of its digits is 36288, while the sum is 40.

The square root of 2491897 is about 1578.5743568169. The cubic root of 2491897 is about 135.5740892821.

The spelling of 2491897 in words is "two million, four hundred ninety-one thousand, eight hundred ninety-seven".