25545517 has 2 divisors, whose sum is σ = 25545518. Its totient is φ = 25545516.

The previous prime is 25545497. The next prime is 25545539. The reversal of 25545517 is 71554552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25542916 + 2601 = 5054^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 25545517 - 2⁷ = 25545389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25546517) 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, 12772758 + 12772759.

It is an arithmetic number, because the mean of its divisors is an integer number (12772759).

Almost surely, 2^25545517 is an apocalyptic number.

It is an amenable number.

25545517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25545517 is an equidigital number, since it uses as much as digits as its factorization.

25545517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35000, while the sum is 34.

The square root of 25545517 is about 5054.2573143836. The cubic root of 25545517 is about 294.5132910910.

It can be divided in two parts, 25545 and 517, that added together give a palindrome (26062).

The spelling of 25545517 in words is "twenty-five million, five hundred forty-five thousand, five hundred seventeen".