25641449 has 2 divisors, whose sum is σ = 25641450. Its totient is φ = 25641448.

The previous prime is 25641443. The next prime is 25641463. The reversal of 25641449 is 94414652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 7425625 = 4268^2 + 2725^2 .

It is a cyclic number.

It is not a de Polignac number, because 25641449 - 2⁸ = 25641193 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25641443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820724 + 12820725.

It is an arithmetic number, because the mean of its divisors is an integer number (12820725).

Almost surely, 2^25641449 is an apocalyptic number.

It is an amenable number.

25641449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25641449 is an equidigital number, since it uses as much as digits as its factorization.

25641449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 25641449 is about 5063.7386385950. The cubic root of 25641449 is about 294.8814960201.

The spelling of 25641449 in words is "twenty-five million, six hundred forty-one thousand, four hundred forty-nine".