25628261 has 2 divisors, whose sum is σ = 25628262. Its totient is φ = 25628260.

The previous prime is 25628249. The next prime is 25628263. The reversal of 25628261 is 16282652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23951236 + 1677025 = 4894^2 + 1295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25628261 is a prime.

Together with 25628263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25628263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12814130 + 12814131.

It is an arithmetic number, because the mean of its divisors is an integer number (12814131).

Almost surely, 2^25628261 is an apocalyptic number.

It is an amenable number.

25628261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25628261 is an equidigital number, since it uses as much as digits as its factorization.

25628261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 25628261 is about 5062.4362712038. The cubic root of 25628261 is about 294.8309325219.

The spelling of 25628261 in words is "twenty-five million, six hundred twenty-eight thousand, two hundred sixty-one".