25790561 has 2 divisors, whose sum is σ = 25790562. Its totient is φ = 25790560.

The previous prime is 25790551. The next prime is 25790563. The reversal of 25790561 is 16509752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17380561 + 8410000 = 4169^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 25790561 - 2¹⁰ = 25789537 is a prime.

Together with 25790563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25790563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12895280 + 12895281.

It is an arithmetic number, because the mean of its divisors is an integer number (12895281).

Almost surely, 2^25790561 is an apocalyptic number.

It is an amenable number.

25790561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25790561 is an equidigital number, since it uses as much as digits as its factorization.

25790561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 25790561 is about 5078.4408040264. The cubic root of 25790561 is about 295.4519969398.

The spelling of 25790561 in words is "twenty-five million, seven hundred ninety thousand, five hundred sixty-one".