25981369 has 2 divisors, whose sum is σ = 25981370. Its totient is φ = 25981368.

The previous prime is 25981339. The next prime is 25981391. The reversal of 25981369 is 96318952.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22325625 + 3655744 = 4725^2 + 1912^2 .

It is a cyclic number.

It is not a de Polignac number, because 25981369 - 2¹³ = 25973177 is a prime.

It is a super-2 number, since 2×25981369² = 1350063070228322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25981309) 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, 12990684 + 12990685.

It is an arithmetic number, because the mean of its divisors is an integer number (12990685).

Almost surely, 2^25981369 is an apocalyptic number.

It is an amenable number.

25981369 is a deficient number, since it is larger than the sum of its proper divisors (1).

25981369 is an equidigital number, since it uses as much as digits as its factorization.

25981369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 25981369 is about 5097.1922663364. The cubic root of 25981369 is about 296.1788280547.

The spelling of 25981369 in words is "twenty-five million, nine hundred eighty-one thousand, three hundred sixty-nine".