25206569 has 2 divisors, whose sum is σ = 25206570. Its totient is φ = 25206568.

The previous prime is 25206499. The next prime is 25206593. The reversal of 25206569 is 96560252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24870169 + 336400 = 4987^2 + 580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25206569 is a prime.

It is a super-2 number, since 2×25206569² = 1270742241503522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25296569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12603284 + 12603285.

It is an arithmetic number, because the mean of its divisors is an integer number (12603285).

Almost surely, 2^25206569 is an apocalyptic number.

It is an amenable number.

25206569 is a deficient number, since it is larger than the sum of its proper divisors (1).

25206569 is an equidigital number, since it uses as much as digits as its factorization.

25206569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 25206569 is about 5020.6144046322. The cubic root of 25206569 is about 293.2049143740.

The spelling of 25206569 in words is "twenty-five million, two hundred six thousand, five hundred sixty-nine".