438146621281 has 2 divisors, whose sum is σ = 438146621282. Its totient is φ = 438146621280.

The previous prime is 438146621279. The next prime is 438146621347. The reversal of 438146621281 is 182126641834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427872974400 + 10273646881 = 654120^2 + 101359^2 .

It is a cyclic number.

It is not a de Polignac number, because 438146621281 - 2¹ = 438146621279 is a prime.

It is a super-2 number, since 2×438146621281² (a number of 24 digits) contains 22 as substring.

Together with 438146621279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (438146621261) 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, 219073310640 + 219073310641.

It is an arithmetic number, because the mean of its divisors is an integer number (219073310641).

Almost surely, 2^438146621281 is an apocalyptic number.

It is an amenable number.

438146621281 is a deficient number, since it is larger than the sum of its proper divisors (1).

438146621281 is an equidigital number, since it uses as much as digits as its factorization.

438146621281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 46.

The spelling of 438146621281 in words is "four hundred thirty-eight billion, one hundred forty-six million, six hundred twenty-one thousand, two hundred eighty-one".