2086517900981 has 2 divisors, whose sum is σ = 2086517900982. Its totient is φ = 2086517900980.

The previous prime is 2086517900881. The next prime is 2086517901059. The reversal of 2086517900981 is 1890097156802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2013149511025 + 73368389956 = 1418855^2 + 270866^2 .

It is a cyclic number.

It is not a de Polignac number, because 2086517900981 - 2¹⁴ = 2086517884597 is a prime.

It is a super-2 number, since 2×2086517900981² (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 (2086517900881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1043258950490 + 1043258950491.

It is an arithmetic number, because the mean of its divisors is an integer number (1043258950491).

Almost surely, 2^{2086517900981} is an apocalyptic number.

It is an amenable number.

2086517900981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2086517900981 is an equidigital number, since it uses as much as digits as its factorization.

2086517900981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 56.

The spelling of 2086517900981 in words is "two trillion, eighty-six billion, five hundred seventeen million, nine hundred thousand, nine hundred eighty-one".