25448221 has 2 divisors, whose sum is σ = 25448222. Its totient is φ = 25448220.

The previous prime is 25448183. The next prime is 25448233. The reversal of 25448221 is 12284452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25140196 + 308025 = 5014^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 25448221 - 2¹¹ = 25446173 is a prime.

It is a super-2 number, since 2×25448221² = 1295223904129682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25448221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25448261) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12724110 + 12724111.

It is an arithmetic number, because the mean of its divisors is an integer number (12724111).

Almost surely, 2^25448221 is an apocalyptic number.

It is an amenable number.

25448221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25448221 is an equidigital number, since it uses as much as digits as its factorization.

25448221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5120, while the sum is 28.

The square root of 25448221 is about 5044.6229789747. The cubic root of 25448221 is about 294.1389080889.

The spelling of 25448221 in words is "twenty-five million, four hundred forty-eight thousand, two hundred twenty-one".