25535813 has 2 divisors, whose sum is σ = 25535814. Its totient is φ = 25535812.

The previous prime is 25535767. The next prime is 25535821. The reversal of 25535813 is 31853552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20232004 + 5303809 = 4498^2 + 2303^2 .

It is a cyclic number.

It is not a de Polignac number, because 25535813 - 2⁸ = 25535557 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25535813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25535833) 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, 12767906 + 12767907.

It is an arithmetic number, because the mean of its divisors is an integer number (12767907).

Almost surely, 2^25535813 is an apocalyptic number.

It is an amenable number.

25535813 is a deficient number, since it is larger than the sum of its proper divisors (1).

25535813 is an equidigital number, since it uses as much as digits as its factorization.

25535813 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 25535813 is about 5053.2972404164. The cubic root of 25535813 is about 294.4759940192.

The spelling of 25535813 in words is "twenty-five million, five hundred thirty-five thousand, eight hundred thirteen".