25518533 has 2 divisors, whose sum is σ = 25518534. Its totient is φ = 25518532.

The previous prime is 25518529. The next prime is 25518541. The reversal of 25518533 is 33581552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14615329 + 10903204 = 3823^2 + 3302^2 .

It is a cyclic number.

It is not a de Polignac number, because 25518533 - 2² = 25518529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25518533.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25518553) 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, 12759266 + 12759267.

It is an arithmetic number, because the mean of its divisors is an integer number (12759267).

Almost surely, 2^25518533 is an apocalyptic number.

It is an amenable number.

25518533 is a deficient number, since it is larger than the sum of its proper divisors (1).

25518533 is an equidigital number, since it uses as much as digits as its factorization.

25518533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 32.

The square root of 25518533 is about 5051.5871763239. The cubic root of 25518533 is about 294.4095553878.

The spelling of 25518533 in words is "twenty-five million, five hundred eighteen thousand, five hundred thirty-three".