25238281 has 2 divisors, whose sum is σ = 25238282. Its totient is φ = 25238280.

The previous prime is 25238237. The next prime is 25238293. The reversal of 25238281 is 18283252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24167056 + 1071225 = 4916^2 + 1035^2 .

It is a cyclic number.

It is not a de Polignac number, because 25238281 - 2¹³ = 25230089 is a prime.

It is a super-2 number, since 2×25238281² = 1273941655669922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25238231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12619140 + 12619141.

It is an arithmetic number, because the mean of its divisors is an integer number (12619141).

Almost surely, 2^25238281 is an apocalyptic number.

It is an amenable number.

25238281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25238281 is an equidigital number, since it uses as much as digits as its factorization.

25238281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7680, while the sum is 31.

The square root of 25238281 is about 5023.7715911454. The cubic root of 25238281 is about 293.3278217227.

The spelling of 25238281 in words is "twenty-five million, two hundred thirty-eight thousand, two hundred eighty-one".