25518331 has 2 divisors, whose sum is σ = 25518332. Its totient is φ = 25518330.

The previous prime is 25518329. The next prime is 25518341. The reversal of 25518331 is 13381552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25518331 - 2¹ = 25518329 is a prime.

It is a super-2 number, since 2×25518331² = 1302370434051122, which contains 22 as substring.

Together with 25518329, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25518331.

It is not a weakly prime, because it can be changed into another prime (25518341) 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, 12759165 + 12759166.

It is an arithmetic number, because the mean of its divisors is an integer number (12759166).

Almost surely, 2^25518331 is an apocalyptic number.

25518331 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518331 is an equidigital number, since it uses as much as digits as its factorization.

25518331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 28.

The square root of 25518331 is about 5051.5671825682. The cubic root of 25518331 is about 294.4087785551.

Adding to 25518331 its reverse (13381552), we get a palindrome (38899883).

The spelling of 25518331 in words is "twenty-five million, five hundred eighteen thousand, three hundred thirty-one".