25999871 has 2 divisors, whose sum is σ = 25999872. Its totient is φ = 25999870.

The previous prime is 25999859. The next prime is 25999877. The reversal of 25999871 is 17899952.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25999871 - 2⁶ = 25999807 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25999877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12999935 + 12999936.

It is an arithmetic number, because the mean of its divisors is an integer number (12999936).

Almost surely, 2^25999871 is an apocalyptic number.

25999871 is a deficient number, since it is larger than the sum of its proper divisors (1).

25999871 is an equidigital number, since it uses as much as digits as its factorization.

25999871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 50.

The square root of 25999871 is about 5099.0068640864. The cubic root of 25999871 is about 296.2491168887.

The spelling of 25999871 in words is "twenty-five million, nine hundred ninety-nine thousand, eight hundred seventy-one".