25512281 has 2 divisors, whose sum is σ = 25512282. Its totient is φ = 25512280.

The previous prime is 25512251. The next prime is 25512283. The reversal of 25512281 is 18221552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21576025 + 3936256 = 4645^2 + 1984^2 .

It is a cyclic number.

It is not a de Polignac number, because 25512281 - 2¹⁰ = 25511257 is a prime.

It is a super-2 number, since 2×25512281² = 1301752963645922, which contains 22 as substring.

Together with 25512283, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25512281.

It is not a weakly prime, because it can be changed into another prime (25512283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12756140 + 12756141.

It is an arithmetic number, because the mean of its divisors is an integer number (12756141).

Almost surely, 2^25512281 is an apocalyptic number.

It is an amenable number.

25512281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25512281 is an equidigital number, since it uses as much as digits as its factorization.

25512281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 26.

The square root of 25512281 is about 5050.9683230050. The cubic root of 25512281 is about 294.3855101330.

The spelling of 25512281 in words is "twenty-five million, five hundred twelve thousand, two hundred eighty-one".