1984244651813 has 2 divisors, whose sum is σ = 1984244651814. Its totient is φ = 1984244651812.

The previous prime is 1984244651797. The next prime is 1984244651891. The reversal of 1984244651813 is 3181564424891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1340299390369 + 643945261444 = 1157713^2 + 802462^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984244651813 - 2⁴ = 1984244651797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1984246651813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992122325906 + 992122325907.

It is an arithmetic number, because the mean of its divisors is an integer number (992122325907).

Almost surely, 2^{1984244651813} is an apocalyptic number.

It is an amenable number.

1984244651813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984244651813 is an equidigital number, since it uses as much as digits as its factorization.

1984244651813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6635520, while the sum is 56.

The spelling of 1984244651813 in words is "one trillion, nine hundred eighty-four billion, two hundred forty-four million, six hundred fifty-one thousand, eight hundred thirteen".