25415447 has 2 divisors, whose sum is σ = 25415448. Its totient is φ = 25415446.

The previous prime is 25415419. The next prime is 25415479. The reversal of 25415447 is 74451452.

It is an a-pointer prime, because the next prime (25415479) can be obtained adding 25415447 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25415447 - 2⁸ = 25415191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25415417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12707723 + 12707724.

It is an arithmetic number, because the mean of its divisors is an integer number (12707724).

Almost surely, 2^25415447 is an apocalyptic number.

25415447 is a deficient number, since it is larger than the sum of its proper divisors (1).

25415447 is an equidigital number, since it uses as much as digits as its factorization.

25415447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 32.

The square root of 25415447 is about 5041.3735231581. The cubic root of 25415447 is about 294.0125829529.

Adding to 25415447 its reverse (74451452), we get a palindrome (99866899).

The spelling of 25415447 in words is "twenty-five million, four hundred fifteen thousand, four hundred forty-seven".