204105125281 has 2 divisors, whose sum is σ = 204105125282. Its totient is φ = 204105125280.

The previous prime is 204105125219. The next prime is 204105125339. The reversal of 204105125281 is 182521501402.

204105125281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202824129600 + 1280995681 = 450360^2 + 35791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204105125281 is a prime.

It is a super-2 number, since 2×204105125281² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204105125201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102052562640 + 102052562641.

It is an arithmetic number, because the mean of its divisors is an integer number (102052562641).

Almost surely, 2^204105125281 is an apocalyptic number.

It is an amenable number.

204105125281 is a deficient number, since it is larger than the sum of its proper divisors (1).

204105125281 is an equidigital number, since it uses as much as digits as its factorization.

204105125281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 31.

Adding to 204105125281 its reverse (182521501402), we get a palindrome (386626626683).

The spelling of 204105125281 in words is "two hundred four billion, one hundred five million, one hundred twenty-five thousand, two hundred eighty-one".