25708261 has 2 divisors, whose sum is σ = 25708262. Its totient is φ = 25708260.

The previous prime is 25708253. The next prime is 25708283. The reversal of 25708261 is 16280752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25553025 + 155236 = 5055^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 25708261 - 2³ = 25708253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25708211) 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, 12854130 + 12854131.

It is an arithmetic number, because the mean of its divisors is an integer number (12854131).

Almost surely, 2^25708261 is an apocalyptic number.

It is an amenable number.

25708261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25708261 is an equidigital number, since it uses as much as digits as its factorization.

25708261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 25708261 is about 5070.3314487319. The cubic root of 25708261 is about 295.1373907573.

The spelling of 25708261 in words is "twenty-five million, seven hundred eight thousand, two hundred sixty-one".