25891361 has 2 divisors, whose sum is σ = 25891362. Its totient is φ = 25891360.

The previous prime is 25891331. The next prime is 25891429. The reversal of 25891361 is 16319852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15555136 + 10336225 = 3944^2 + 3215^2 .

It is a cyclic number.

It is not a de Polignac number, because 25891361 - 2⁶ = 25891297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25891301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12945680 + 12945681.

It is an arithmetic number, because the mean of its divisors is an integer number (12945681).

Almost surely, 2^25891361 is an apocalyptic number.

It is an amenable number.

25891361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25891361 is an equidigital number, since it uses as much as digits as its factorization.

25891361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 25891361 is about 5088.3554317677. The cubic root of 25891361 is about 295.8364120731.

It can be divided in two parts, 258 and 91361, that added together give a palindrome (91619).

The spelling of 25891361 in words is "twenty-five million, eight hundred ninety-one thousand, three hundred sixty-one".