25958209 has 2 divisors, whose sum is σ = 25958210. Its totient is φ = 25958208.

The previous prime is 25958203. The next prime is 25958221. The reversal of 25958209 is 90285952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22771984 + 3186225 = 4772^2 + 1785^2 .

It is a cyclic number.

It is not a de Polignac number, because 25958209 - 2¹³ = 25950017 is a prime.

It is a super-2 number, since 2×25958209² = 1347657228975362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25958203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12979104 + 12979105.

It is an arithmetic number, because the mean of its divisors is an integer number (12979105).

Almost surely, 2^25958209 is an apocalyptic number.

It is an amenable number.

25958209 is a deficient number, since it is larger than the sum of its proper divisors (1).

25958209 is an equidigital number, since it uses as much as digits as its factorization.

25958209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 25958209 is about 5094.9199208623. The cubic root of 25958209 is about 296.0907965005.

The spelling of 25958209 in words is "twenty-five million, nine hundred fifty-eight thousand, two hundred nine".