25505261 has 2 divisors, whose sum is σ = 25505262. Its totient is φ = 25505260.

The previous prime is 25505231. The next prime is 25505273. The reversal of 25505261 is 16250552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13213225 + 12292036 = 3635^2 + 3506^2 .

It is a cyclic number.

It is not a de Polignac number, because 25505261 - 2²² = 21310957 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25505261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25505231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752630 + 12752631.

It is an arithmetic number, because the mean of its divisors is an integer number (12752631).

Almost surely, 2^25505261 is an apocalyptic number.

It is an amenable number.

25505261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25505261 is an equidigital number, since it uses as much as digits as its factorization.

25505261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 25505261 is about 5050.2733589381. The cubic root of 25505261 is about 294.3585064603.

The spelling of 25505261 in words is "twenty-five million, five hundred five thousand, two hundred sixty-one".