2001115517 has 2 divisors, whose sum is σ = 2001115518. Its totient is φ = 2001115516.

The previous prime is 2001115499. The next prime is 2001115573. The reversal of 2001115517 is 7155111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1775695321 + 225420196 = 42139^2 + 15014^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001115517 - 2⁸ = 2001115261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001115492 and 2001115501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001111517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000557758 + 1000557759.

It is an arithmetic number, because the mean of its divisors is an integer number (1000557759).

Almost surely, 2^2001115517 is an apocalyptic number.

It is an amenable number.

2001115517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001115517 is an equidigital number, since it uses as much as digits as its factorization.

2001115517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 2001115517 is about 44733.8296706195. The cubic root of 2001115517 is about 1260.1552502495.

Adding to 2001115517 its reverse (7155111002), we get a palindrome (9156226519).

The spelling of 2001115517 in words is "two billion, one million, one hundred fifteen thousand, five hundred seventeen".