25826561 has 2 divisors, whose sum is σ = 25826562. Its totient is φ = 25826560.

The previous prime is 25826551. The next prime is 25826573. The reversal of 25826561 is 16562852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25816561 + 10000 = 5081^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 25826561 - 2¹⁰ = 25825537 is a prime.

It is a super-2 number, since 2×25826561² = 1334022506173442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25826551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12913280 + 12913281.

It is an arithmetic number, because the mean of its divisors is an integer number (12913281).

Almost surely, 2^25826561 is an apocalyptic number.

It is an amenable number.

25826561 is a deficient number, since it is larger than the sum of its proper divisors (1).

25826561 is an equidigital number, since it uses as much as digits as its factorization.

25826561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 35.

The square root of 25826561 is about 5081.9839629814. The cubic root of 25826561 is about 295.5894028537.

The spelling of 25826561 in words is "twenty-five million, eight hundred twenty-six thousand, five hundred sixty-one".