25287749 has 2 divisors, whose sum is σ = 25287750. Its totient is φ = 25287748.

The previous prime is 25287737. The next prime is 25287751. The reversal of 25287749 is 94778252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13557124 + 11730625 = 3682^2 + 3425^2 .

It is a cyclic number.

It is not a de Polignac number, because 25287749 - 2¹⁶ = 25222213 is a prime.

Together with 25287751, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25287719) 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 as a sum of consecutive naturals, namely, 12643874 + 12643875.

It is an arithmetic number, because the mean of its divisors is an integer number (12643875).

Almost surely, 2^25287749 is an apocalyptic number.

It is an amenable number.

25287749 is a deficient number, since it is larger than the sum of its proper divisors (1).

25287749 is an equidigital number, since it uses as much as digits as its factorization.

25287749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 44.

The square root of 25287749 is about 5028.6925736219. The cubic root of 25287749 is about 293.5193412470.

The spelling of 25287749 in words is "twenty-five million, two hundred eighty-seven thousand, seven hundred forty-nine".