25889581 has 2 divisors, whose sum is σ = 25889582. Its totient is φ = 25889580.

The previous prime is 25889579. The next prime is 25889587. The reversal of 25889581 is 18598852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25755625 + 133956 = 5075^2 + 366^2 .

It is a cyclic number.

It is not a de Polignac number, because 25889581 - 2¹ = 25889579 is a prime.

It is a super-2 number, since 2×25889581² = 1340540808711122, which contains 22 as substring.

Together with 25889579, 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 (25889587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12944790 + 12944791.

It is an arithmetic number, because the mean of its divisors is an integer number (12944791).

Almost surely, 2^25889581 is an apocalyptic number.

It is an amenable number.

25889581 is a deficient number, since it is larger than the sum of its proper divisors (1).

25889581 is an equidigital number, since it uses as much as digits as its factorization.

25889581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 46.

The square root of 25889581 is about 5088.1805195964. The cubic root of 25889581 is about 295.8296324517.

The spelling of 25889581 in words is "twenty-five million, eight hundred eighty-nine thousand, five hundred eighty-one".