25279609 has 2 divisors, whose sum is σ = 25279610. Its totient is φ = 25279608.

The previous prime is 25279591. The next prime is 25279613. The reversal of 25279609 is 90697252.

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., 21418384 + 3861225 = 4628^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 25279609 - 2¹¹ = 25277561 is a prime.

It is not a weakly prime, because it can be changed into another prime (25279409) 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, 12639804 + 12639805.

It is an arithmetic number, because the mean of its divisors is an integer number (12639805).

Almost surely, 2^25279609 is an apocalyptic number.

It is an amenable number.

25279609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25279609 is an equidigital number, since it uses as much as digits as its factorization.

25279609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 25279609 is about 5027.8831529780. The cubic root of 25279609 is about 293.4878437309.

The spelling of 25279609 in words is "twenty-five million, two hundred seventy-nine thousand, six hundred nine".