981428324321 has 2 divisors, whose sum is σ = 981428324322. Its totient is φ = 981428324320.

The previous prime is 981428324297. The next prime is 981428324381. The reversal of 981428324321 is 123423824189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 948861069025 + 32567255296 = 974095^2 + 180464^2 .

It is an emirp because it is prime and its reverse (123423824189) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981428324321 is a prime.

It is a super-2 number, since 2×981428324321² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (981428324381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490714162160 + 490714162161.

It is an arithmetic number, because the mean of its divisors is an integer number (490714162161).

Almost surely, 2^981428324321 is an apocalyptic number.

It is an amenable number.

981428324321 is a deficient number, since it is larger than the sum of its proper divisors (1).

981428324321 is an equidigital number, since it uses as much as digits as its factorization.

981428324321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 47.

The spelling of 981428324321 in words is "nine hundred eighty-one billion, four hundred twenty-eight million, three hundred twenty-four thousand, three hundred twenty-one".