25705261 has 2 divisors, whose sum is σ = 25705262. Its totient is φ = 25705260.

The previous prime is 25705249. The next prime is 25705279. The reversal of 25705261 is 16250752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 361 = 5070^2 + 19^2 .

It is a cyclic number.

It is not a de Polignac number, because 25705261 - 2⁷ = 25705133 is a prime.

It is equal to p_1607194 and since 25705261 and 1607194 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25703261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12852630 + 12852631.

It is an arithmetic number, because the mean of its divisors is an integer number (12852631).

Almost surely, 2^25705261 is an apocalyptic number.

It is an amenable number.

25705261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25705261 is an equidigital number, since it uses as much as digits as its factorization.

25705261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 25705261 is about 5070.0356014529. The cubic root of 25705261 is about 295.1259100557.

The spelling of 25705261 in words is "twenty-five million, seven hundred five thousand, two hundred sixty-one".