25918517 has 2 divisors, whose sum is σ = 25918518. Its totient is φ = 25918516.

The previous prime is 25918513. The next prime is 25918553. The reversal of 25918517 is 71581952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15100996 + 10817521 = 3886^2 + 3289^2 .

It is a cyclic number.

It is not a de Polignac number, because 25918517 - 2² = 25918513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25918513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12959258 + 12959259.

It is an arithmetic number, because the mean of its divisors is an integer number (12959259).

Almost surely, 2^25918517 is an apocalyptic number.

It is an amenable number.

25918517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25918517 is an equidigital number, since it uses as much as digits as its factorization.

25918517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 38.

The square root of 25918517 is about 5091.0231781048. The cubic root of 25918517 is about 295.9398046878.

The spelling of 25918517 in words is "twenty-five million, nine hundred eighteen thousand, five hundred seventeen".