25898909 has 2 divisors, whose sum is σ = 25898910. Its totient is φ = 25898908.

The previous prime is 25898879. The next prime is 25898947. The reversal of 25898909 is 90989852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17935225 + 7963684 = 4235^2 + 2822^2 .

It is a cyclic number.

It is not a de Polignac number, because 25898909 - 2¹⁶ = 25833373 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25898959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12949454 + 12949455.

It is an arithmetic number, because the mean of its divisors is an integer number (12949455).

Almost surely, 2^25898909 is an apocalyptic number.

It is an amenable number.

25898909 is a deficient number, since it is larger than the sum of its proper divisors (1).

25898909 is an equidigital number, since it uses as much as digits as its factorization.

25898909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 25898909 is about 5089.0970711905. The cubic root of 25898909 is about 295.8651572633.

The spelling of 25898909 in words is "twenty-five million, eight hundred ninety-eight thousand, nine hundred nine".