25533281 has 2 divisors, whose sum is σ = 25533282. Its totient is φ = 25533280.

The previous prime is 25533259. The next prime is 25533317. The reversal of 25533281 is 18233552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 9859600 = 3959^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 25533281 - 2¹⁸ = 25271137 is a prime.

It is a super-2 number, since 2×25533281² = 1303896877249922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25533241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12766640 + 12766641.

It is an arithmetic number, because the mean of its divisors is an integer number (12766641).

Almost surely, 2^25533281 is an apocalyptic number.

It is an amenable number.

25533281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25533281 is an equidigital number, since it uses as much as digits as its factorization.

25533281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 25533281 is about 5053.0467047119. The cubic root of 25533281 is about 294.4662607887.

The spelling of 25533281 in words is "twenty-five million, five hundred thirty-three thousand, two hundred eighty-one".