1981707030917 has 2 divisors, whose sum is σ = 1981707030918. Its totient is φ = 1981707030916.

The previous prime is 1981707030859. The next prime is 1981707030937. The reversal of 1981707030917 is 7190307071891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1897564105441 + 84142925476 = 1377521^2 + 290074^2 .

It is a cyclic number.

It is not a de Polignac number, because 1981707030917 - 2¹⁴ = 1981707014533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1981707030937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990853515458 + 990853515459.

It is an arithmetic number, because the mean of its divisors is an integer number (990853515459).

Almost surely, 2^{1981707030917} is an apocalyptic number.

It is an amenable number.

1981707030917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981707030917 is an equidigital number, since it uses as much as digits as its factorization.

1981707030917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 666792, while the sum is 53.

The spelling of 1981707030917 in words is "one trillion, nine hundred eighty-one billion, seven hundred seven million, thirty thousand, nine hundred seventeen".