259438831921 has 2 divisors, whose sum is σ = 259438831922. Its totient is φ = 259438831920.

The previous prime is 259438831793. The next prime is 259438831997. The reversal of 259438831921 is 129138834952.

259438831921 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., 183945774321 + 75493057600 = 428889^2 + 274760^2 .

It is a cyclic number.

It is not a de Polignac number, because 259438831921 - 2⁷ = 259438831793 is a prime.

It is not a weakly prime, because it can be changed into another prime (259432831921) 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, 129719415960 + 129719415961.

It is an arithmetic number, because the mean of its divisors is an integer number (129719415961).

Almost surely, 2^259438831921 is an apocalyptic number.

It is an amenable number.

259438831921 is a deficient number, since it is larger than the sum of its proper divisors (1).

259438831921 is an equidigital number, since it uses as much as digits as its factorization.

259438831921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 55.

The spelling of 259438831921 in words is "two hundred fifty-nine billion, four hundred thirty-eight million, eight hundred thirty-one thousand, nine hundred twenty-one".