25958809 has 2 divisors, whose sum is σ = 25958810. Its totient is φ = 25958808.

The previous prime is 25958771. The next prime is 25958827. The reversal of 25958809 is 90885952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23068809 + 2890000 = 4803^2 + 1700^2 .

It is a cyclic number.

It is not a de Polignac number, because 25958809 - 2²¹ = 23861657 is a prime.

It is not a weakly prime, because it can be changed into another prime (25958209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12979404 + 12979405.

It is an arithmetic number, because the mean of its divisors is an integer number (12979405).

Almost surely, 2^25958809 is an apocalyptic number.

It is an amenable number.

25958809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25958809 is an equidigital number, since it uses as much as digits as its factorization.

25958809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 25958809 is about 5094.9788027037. The cubic root of 25958809 is about 296.0930777713.

The spelling of 25958809 in words is "twenty-five million, nine hundred fifty-eight thousand, eight hundred nine".