25006409 has 2 divisors, whose sum is σ = 25006410. Its totient is φ = 25006408.

The previous prime is 25006391. The next prime is 25006441. The reversal of 25006409 is 90460052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 8684809 = 4040^2 + 2947^2 .

It is a cyclic number.

It is not a de Polignac number, because 25006409 - 2⁸ = 25006153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25006469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12503204 + 12503205.

It is an arithmetic number, because the mean of its divisors is an integer number (12503205).

Almost surely, 2^25006409 is an apocalyptic number.

It is an amenable number.

25006409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25006409 is an equidigital number, since it uses as much as digits as its factorization.

25006409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 25006409 is about 5000.6408589300. The cubic root of 25006409 is about 292.4267583926.

The spelling of 25006409 in words is "twenty-five million, six thousand, four hundred nine".