25516889 has 2 divisors, whose sum is σ = 25516890. Its totient is φ = 25516888.

The previous prime is 25516879. The next prime is 25516891. The reversal of 25516889 is 98861552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18318400 + 7198489 = 4280^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 25516889 - 2⁸ = 25516633 is a prime.

It is a super-2 number, since 2×25516889² = 1302223248476642, which contains 22 as substring.

Together with 25516891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25516859) 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, 12758444 + 12758445.

It is an arithmetic number, because the mean of its divisors is an integer number (12758445).

Almost surely, 2^25516889 is an apocalyptic number.

It is an amenable number.

25516889 is a deficient number, since it is larger than the sum of its proper divisors (1).

25516889 is an equidigital number, since it uses as much as digits as its factorization.

25516889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 172800, while the sum is 44.

The square root of 25516889 is about 5051.4244525678. The cubic root of 25516889 is about 294.4032329279.

The spelling of 25516889 in words is "twenty-five million, five hundred sixteen thousand, eight hundred eighty-nine".