2001817117081 has 2 divisors, whose sum is σ = 2001817117082. Its totient is φ = 2001817117080.

The previous prime is 2001817117063. The next prime is 2001817117087. The reversal of 2001817117081 is 1807117181002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1998875681856 + 2941435225 = 1413816^2 + 54235^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001817117081 - 2⁷ = 2001817116953 is a prime.

It is a super-2 number, since 2×2001817117081² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2001817117081.

It is not a weakly prime, because it can be changed into another prime (2001817117087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000908558540 + 1000908558541.

It is an arithmetic number, because the mean of its divisors is an integer number (1000908558541).

Almost surely, 2^{2001817117081} is an apocalyptic number.

It is an amenable number.

2001817117081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001817117081 is an equidigital number, since it uses as much as digits as its factorization.

2001817117081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 37.

The spelling of 2001817117081 in words is "two trillion, one billion, eight hundred seventeen million, one hundred seventeen thousand, eighty-one".