25530247 has 2 divisors, whose sum is σ = 25530248. Its totient is φ = 25530246.

The previous prime is 25530191. The next prime is 25530257. The reversal of 25530247 is 74203552.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25530247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25530257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12765123 + 12765124.

It is an arithmetic number, because the mean of its divisors is an integer number (12765124).

Almost surely, 2^25530247 is an apocalyptic number.

25530247 is a deficient number, since it is larger than the sum of its proper divisors (1).

25530247 is an equidigital number, since it uses as much as digits as its factorization.

25530247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 25530247 is about 5052.7464808755. The cubic root of 25530247 is about 294.4545969786.

Adding to 25530247 its reverse (74203552), we get a palindrome (99733799).

The spelling of 25530247 in words is "twenty-five million, five hundred thirty thousand, two hundred forty-seven".