25912009 has 2 divisors, whose sum is σ = 25912010. Its totient is φ = 25912008.

The previous prime is 25911997. The next prime is 25912013. The reversal of 25912009 is 90021952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23736384 + 2175625 = 4872^2 + 1475^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25912009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25912039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12956004 + 12956005.

It is an arithmetic number, because the mean of its divisors is an integer number (12956005).

Almost surely, 2^25912009 is an apocalyptic number.

It is an amenable number.

25912009 is a deficient number, since it is larger than the sum of its proper divisors (1).

25912009 is an equidigital number, since it uses as much as digits as its factorization.

25912009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 25912009 is about 5090.3839737293. The cubic root of 25912009 is about 295.9150329841.

The spelling of 25912009 in words is "twenty-five million, nine hundred twelve thousand, nine".