25396621 has 2 divisors, whose sum is σ = 25396622. Its totient is φ = 25396620.

The previous prime is 25396619. The next prime is 25396633. The reversal of 25396621 is 12669352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 6786025 = 4314^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 25396621 - 2¹ = 25396619 is a prime.

Together with 25396619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25396601) 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, 12698310 + 12698311.

It is an arithmetic number, because the mean of its divisors is an integer number (12698311).

Almost surely, 2^25396621 is an apocalyptic number.

It is an amenable number.

25396621 is a deficient number, since it is larger than the sum of its proper divisors (1).

25396621 is an equidigital number, since it uses as much as digits as its factorization.

25396621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 34.

The square root of 25396621 is about 5039.5060273801. The cubic root of 25396621 is about 293.9399703128.

The spelling of 25396621 in words is "twenty-five million, three hundred ninety-six thousand, six hundred twenty-one".