25518841 has 2 divisors, whose sum is σ = 25518842. Its totient is φ = 25518840.

The previous prime is 25518839. The next prime is 25518877. The reversal of 25518841 is 14881552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13719616 + 11799225 = 3704^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 25518841 - 2¹ = 25518839 is a prime.

It is a super-2 number, since 2×25518841² = 1302422491966562, which contains 22 as substring.

Together with 25518839, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 25518797 and 25518806.

It is not a weakly prime, because it can be changed into another prime (25518041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12759420 + 12759421.

It is an arithmetic number, because the mean of its divisors is an integer number (12759421).

Almost surely, 2^25518841 is an apocalyptic number.

It is an amenable number.

25518841 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518841 is an equidigital number, since it uses as much as digits as its factorization.

25518841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12800, while the sum is 34.

The square root of 25518841 is about 5051.6176617001. The cubic root of 25518841 is about 294.4107398573.

The spelling of 25518841 in words is "twenty-five million, five hundred eighteen thousand, eight hundred forty-one".