25320641 has 2 divisors, whose sum is σ = 25320642. Its totient is φ = 25320640.

The previous prime is 25320637. The next prime is 25320643. The reversal of 25320641 is 14602352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15840400 + 9480241 = 3980^2 + 3079^2 .

It is a cyclic number.

It is not a de Polignac number, because 25320641 - 2² = 25320637 is a prime.

It is a super-2 number, since 2×25320641² = 1282269721301762, which contains 22 as substring.

Together with 25320643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25320643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12660320 + 12660321.

It is an arithmetic number, because the mean of its divisors is an integer number (12660321).

Almost surely, 2^25320641 is an apocalyptic number.

It is an amenable number.

25320641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25320641 is an equidigital number, since it uses as much as digits as its factorization.

25320641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 25320641 is about 5031.9619434173. The cubic root of 25320641 is about 293.6465471828.

Adding to 25320641 its reverse (14602352), we get a palindrome (39922993).

The spelling of 25320641 in words is "twenty-five million, three hundred twenty thousand, six hundred forty-one".