25646261 has 2 divisors, whose sum is σ = 25646262. Its totient is φ = 25646260.

The previous prime is 25646249. The next prime is 25646273. The reversal of 25646261 is 16264652.

It is a balanced prime because it is at equal distance from previous prime (25646249) and next prime (25646273).

It can be written as a sum of positive squares in only one way, i.e., 21215236 + 4431025 = 4606^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 25646261 - 2²² = 21451957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25646861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12823130 + 12823131.

It is an arithmetic number, because the mean of its divisors is an integer number (12823131).

Almost surely, 2^25646261 is an apocalyptic number.

It is an amenable number.

25646261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25646261 is an equidigital number, since it uses as much as digits as its factorization.

25646261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 32.

The square root of 25646261 is about 5064.2137593115. The cubic root of 25646261 is about 294.8999411686.

The spelling of 25646261 in words is "twenty-five million, six hundred forty-six thousand, two hundred sixty-one".