25606517 has 2 divisors, whose sum is σ = 25606518. Its totient is φ = 25606516.

The previous prime is 25606513. The next prime is 25606523. The reversal of 25606517 is 71560652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24512401 + 1094116 = 4951^2 + 1046^2 .

It is a cyclic number.

It is not a de Polignac number, because 25606517 - 2² = 25606513 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25606513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12803258 + 12803259.

It is an arithmetic number, because the mean of its divisors is an integer number (12803259).

Almost surely, 2^25606517 is an apocalyptic number.

It is an amenable number.

25606517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25606517 is an equidigital number, since it uses as much as digits as its factorization.

25606517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 25606517 is about 5060.2882328974. The cubic root of 25606517 is about 294.7475269707.

The spelling of 25606517 in words is "twenty-five million, six hundred six thousand, five hundred seventeen".