25869709 has 2 divisors, whose sum is σ = 25869710. Its totient is φ = 25869708.

The previous prime is 25869661. The next prime is 25869721. The reversal of 25869709 is 90796852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12981609 + 12888100 = 3603^2 + 3590^2 .

It is a cyclic number.

It is not a de Polignac number, because 25869709 - 2⁷ = 25869581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25869799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12934854 + 12934855.

It is an arithmetic number, because the mean of its divisors is an integer number (12934855).

Almost surely, 2^25869709 is an apocalyptic number.

It is an amenable number.

25869709 is a deficient number, since it is larger than the sum of its proper divisors (1).

25869709 is an equidigital number, since it uses as much as digits as its factorization.

25869709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 25869709 is about 5086.2273838278. The cubic root of 25869709 is about 295.7539233443.

The spelling of 25869709 in words is "twenty-five million, eight hundred sixty-nine thousand, seven hundred nine".