25621441 has 2 divisors, whose sum is σ = 25621442. Its totient is φ = 25621440.

The previous prime is 25621423. The next prime is 25621447. The reversal of 25621441 is 14412652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14592400 + 11029041 = 3820^2 + 3321^2 .

It is a cyclic number.

It is not a de Polignac number, because 25621441 - 2⁹ = 25620929 is a prime.

It is not a weakly prime, because it can be changed into another prime (25621447) 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, 12810720 + 12810721.

It is an arithmetic number, because the mean of its divisors is an integer number (12810721).

Almost surely, 2^25621441 is an apocalyptic number.

It is an amenable number.

25621441 is a deficient number, since it is larger than the sum of its proper divisors (1).

25621441 is an equidigital number, since it uses as much as digits as its factorization.

25621441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 25.

The square root of 25621441 is about 5061.7626376589. The cubic root of 25621441 is about 294.8047774719.

It can be divided in two parts, 25621 and 441, that added together give a palindrome (26062).

The spelling of 25621441 in words is "twenty-five million, six hundred twenty-one thousand, four hundred forty-one".