1993706483981 has 2 divisors, whose sum is σ = 1993706483982. Its totient is φ = 1993706483980.

The previous prime is 1993706483917. The next prime is 1993706483987. The reversal of 1993706483981 is 1893846073991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1306563302500 + 687143181481 = 1143050^2 + 828941^2 .

It is a cyclic number.

It is not a de Polignac number, because 1993706483981 - 2⁶ = 1993706483917 is a prime.

It is a super-2 number, since 2×1993706483981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1993706483987) 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, 996853241990 + 996853241991.

It is an arithmetic number, because the mean of its divisors is an integer number (996853241991).

Almost surely, 2^{1993706483981} is an apocalyptic number.

It is an amenable number.

1993706483981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993706483981 is an equidigital number, since it uses as much as digits as its factorization.

1993706483981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70543872, while the sum is 68.

The spelling of 1993706483981 in words is "one trillion, nine hundred ninety-three billion, seven hundred six million, four hundred eighty-three thousand, nine hundred eighty-one".