25961489 has 2 divisors, whose sum is σ = 25961490. Its totient is φ = 25961488.

The previous prime is 25961461. The next prime is 25961491. The reversal of 25961489 is 98416952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19509889 + 6451600 = 4417^2 + 2540^2 .

It is a cyclic number.

It is not a de Polignac number, because 25961489 - 2²⁰ = 24912913 is a prime.

It is a super-2 number, since 2×25961489² = 1347997822194242, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 25961491, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25961189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12980744 + 12980745.

It is an arithmetic number, because the mean of its divisors is an integer number (12980745).

Almost surely, 2^25961489 is an apocalyptic number.

It is an amenable number.

25961489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25961489 is an equidigital number, since it uses as much as digits as its factorization.

25961489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 25961489 is about 5095.2417999541. The cubic root of 25961489 is about 296.1032670182.

The spelling of 25961489 in words is "twenty-five million, nine hundred sixty-one thousand, four hundred eighty-nine".