25551959 has 2 divisors, whose sum is σ = 25551960. Its totient is φ = 25551958.

The previous prime is 25551947. The next prime is 25551961. The reversal of 25551959 is 95915552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25551959 - 2⁸ = 25551703 is a prime.

Together with 25551961, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25551359) 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, 12775979 + 12775980.

It is an arithmetic number, because the mean of its divisors is an integer number (12775980).

Almost surely, 2^25551959 is an apocalyptic number.

25551959 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551959 is an equidigital number, since it uses as much as digits as its factorization.

25551959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 101250, while the sum is 41.

The square root of 25551959 is about 5054.8945587421. The cubic root of 25551959 is about 294.5380455343.

The spelling of 25551959 in words is "twenty-five million, five hundred fifty-one thousand, nine hundred fifty-nine".