25986517 has 2 divisors, whose sum is σ = 25986518. Its totient is φ = 25986516.

The previous prime is 25986511. The next prime is 25986533. The reversal of 25986517 is 71568952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13883076 + 12103441 = 3726^2 + 3479^2 .

It is a cyclic number.

It is not a de Polignac number, because 25986517 - 2¹⁵ = 25953749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25986511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12993258 + 12993259.

It is an arithmetic number, because the mean of its divisors is an integer number (12993259).

Almost surely, 2^25986517 is an apocalyptic number.

It is an amenable number.

25986517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25986517 is an equidigital number, since it uses as much as digits as its factorization.

25986517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 25986517 is about 5097.6972252185. The cubic root of 25986517 is about 296.1983885830.

The spelling of 25986517 in words is "twenty-five million, nine hundred eighty-six thousand, five hundred seventeen".