25919281 has 2 divisors, whose sum is σ = 25919282. Its totient is φ = 25919280.

The previous prime is 25919233. The next prime is 25919291. The reversal of 25919281 is 18291952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21013056 + 4906225 = 4584^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 25919281 - 2¹¹ = 25917233 is a prime.

It is a super-2 number, since 2×25919281² = 1343618255113922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25919281.

It is not a weakly prime, because it can be changed into another prime (25919291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12959640 + 12959641.

It is an arithmetic number, because the mean of its divisors is an integer number (12959641).

Almost surely, 2^25919281 is an apocalyptic number.

It is an amenable number.

25919281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25919281 is an equidigital number, since it uses as much as digits as its factorization.

25919281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 25919281 is about 5091.0982115846. The cubic root of 25919281 is about 295.9427124646.

The spelling of 25919281 in words is "twenty-five million, nine hundred nineteen thousand, two hundred eighty-one".