25631449 has 2 divisors, whose sum is σ = 25631450. Its totient is φ = 25631448.

The previous prime is 25631443. The next prime is 25631503. The reversal of 25631449 is 94413652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23941449 + 1690000 = 4893^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 25631449 - 2⁷ = 25631321 is a prime.

It is not a weakly prime, because it can be changed into another prime (25631443) 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, 12815724 + 12815725.

It is an arithmetic number, because the mean of its divisors is an integer number (12815725).

Almost surely, 2^25631449 is an apocalyptic number.

It is an amenable number.

25631449 is a deficient number, since it is larger than the sum of its proper divisors (1).

25631449 is an equidigital number, since it uses as much as digits as its factorization.

25631449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 34.

The square root of 25631449 is about 5062.7511295737. The cubic root of 25631449 is about 294.8431570741.

The spelling of 25631449 in words is "twenty-five million, six hundred thirty-one thousand, four hundred forty-nine".