253889405921 has 2 divisors, whose sum is σ = 253889405922. Its totient is φ = 253889405920.

The previous prime is 253889405873. The next prime is 253889405953. The reversal of 253889405921 is 129504988352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197798115025 + 56091290896 = 444745^2 + 236836^2 .

It is a cyclic number.

It is not a de Polignac number, because 253889405921 - 2⁶ = 253889405857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (253889405321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126944702960 + 126944702961.

It is an arithmetic number, because the mean of its divisors is an integer number (126944702961).

Almost surely, 2^253889405921 is an apocalyptic number.

It is an amenable number.

253889405921 is a deficient number, since it is larger than the sum of its proper divisors (1).

253889405921 is an equidigital number, since it uses as much as digits as its factorization.

253889405921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6220800, while the sum is 56.

The spelling of 253889405921 in words is "two hundred fifty-three billion, eight hundred eighty-nine million, four hundred five thousand, nine hundred twenty-one".