25055621 has 2 divisors, whose sum is σ = 25055622. Its totient is φ = 25055620.

The previous prime is 25055609. The next prime is 25055647. The reversal of 25055621 is 12655052.

It is an a-pointer prime, because the next prime (25055647) can be obtained adding 25055621 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 5827396 = 4385^2 + 2414^2 .

It is a cyclic number.

It is not a de Polignac number, because 25055621 - 2⁶ = 25055557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25055651) 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, 12527810 + 12527811.

It is an arithmetic number, because the mean of its divisors is an integer number (12527811).

Almost surely, 2^25055621 is an apocalyptic number.

It is an amenable number.

25055621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25055621 is an equidigital number, since it uses as much as digits as its factorization.

25055621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 25055621 is about 5005.5590097411. The cubic root of 25055621 is about 292.6184622558.

The spelling of 25055621 in words is "twenty-five million, fifty-five thousand, six hundred twenty-one".