25209871 has 2 divisors, whose sum is σ = 25209872. Its totient is φ = 25209870.

The previous prime is 25209869. The next prime is 25209883. The reversal of 25209871 is 17890252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25209871 - 2¹ = 25209869 is a prime.

Together with 25209869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25209071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12604935 + 12604936.

It is an arithmetic number, because the mean of its divisors is an integer number (12604936).

Almost surely, 2^25209871 is an apocalyptic number.

25209871 is a deficient number, since it is larger than the sum of its proper divisors (1).

25209871 is an equidigital number, since it uses as much as digits as its factorization.

25209871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 25209871 is about 5020.9432380779. The cubic root of 25209871 is about 293.2177168615.

The spelling of 25209871 in words is "twenty-five million, two hundred nine thousand, eight hundred seventy-one".