2491589 has 2 divisors, whose sum is σ = 2491590. Its totient is φ = 2491588.

The previous prime is 2491553. The next prime is 2491607. The reversal of 2491589 is 9851942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2455489 + 36100 = 1567^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 2491589 - 2¹² = 2487493 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2491519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1245794 + 1245795.

It is an arithmetic number, because the mean of its divisors is an integer number (1245795).

2^2491589 is an apocalyptic number.

It is an amenable number.

2491589 is a deficient number, since it is larger than the sum of its proper divisors (1).

2491589 is an equidigital number, since it uses as much as digits as its factorization.

2491589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 2491589 is about 1578.4767974221. The cubic root of 2491589 is about 135.5685033717.

It can be divided in two parts, 249158 and 9, that multiplied together give a palindrome (2242422).

The spelling of 2491589 in words is "two million, four hundred ninety-one thousand, five hundred eighty-nine".