25855901 has 2 divisors, whose sum is σ = 25855902. Its totient is φ = 25855900.

The previous prime is 25855883. The next prime is 25855909. The reversal of 25855901 is 10955852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18705625 + 7150276 = 4325^2 + 2674^2 .

It is a cyclic number.

It is not a de Polignac number, because 25855901 - 2²² = 21661597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25855909) 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, 12927950 + 12927951.

It is an arithmetic number, because the mean of its divisors is an integer number (12927951).

Almost surely, 2^25855901 is an apocalyptic number.

It is an amenable number.

25855901 is a deficient number, since it is larger than the sum of its proper divisors (1).

25855901 is an equidigital number, since it uses as much as digits as its factorization.

25855901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 25855901 is about 5084.8698115094. The cubic root of 25855901 is about 295.7012942642.

The spelling of 25855901 in words is "twenty-five million, eight hundred fifty-five thousand, nine hundred one".