25605817 has 2 divisors, whose sum is σ = 25605818. Its totient is φ = 25605816.

The previous prime is 25605773. The next prime is 25605821. The reversal of 25605817 is 71850652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 12033961 = 3684^2 + 3469^2 .

It is a cyclic number.

It is not a de Polignac number, because 25605817 - 2¹¹ = 25603769 is a prime.

It is not a weakly prime, because it can be changed into another prime (25605017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12802908 + 12802909.

It is an arithmetic number, because the mean of its divisors is an integer number (12802909).

Almost surely, 2^25605817 is an apocalyptic number.

It is an amenable number.

25605817 is a deficient number, since it is larger than the sum of its proper divisors (1).

25605817 is an equidigital number, since it uses as much as digits as its factorization.

25605817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 25605817 is about 5060.2190664041. The cubic root of 25605817 is about 294.7448411290.

The spelling of 25605817 in words is "twenty-five million, six hundred five thousand, eight hundred seventeen".