1983280337921 has 2 divisors, whose sum is σ = 1983280337922. Its totient is φ = 1983280337920.

The previous prime is 1983280337917. The next prime is 1983280337963. The reversal of 1983280337921 is 1297330823891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1174654954225 + 808625383696 = 1083815^2 + 899236^2 .

It is a cyclic number.

It is not a de Polignac number, because 1983280337921 - 2² = 1983280337917 is a prime.

It is not a weakly prime, because it can be changed into another prime (1983280330921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991640168960 + 991640168961.

It is an arithmetic number, because the mean of its divisors is an integer number (991640168961).

Almost surely, 2^{1983280337921} is an apocalyptic number.

It is an amenable number.

1983280337921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983280337921 is an equidigital number, since it uses as much as digits as its factorization.

1983280337921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 1983280337921 in words is "one trillion, nine hundred eighty-three billion, two hundred eighty million, three hundred thirty-seven thousand, nine hundred twenty-one".