2001111517 has 2 divisors, whose sum is σ = 2001111518. Its totient is φ = 2001111516.

The previous prime is 2001111493. The next prime is 2001111529. The reversal of 2001111517 is 7151111002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1806760036 + 194351481 = 42506^2 + 13941^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001111517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001111494 and 2001111503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001111547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000555758 + 1000555759.

It is an arithmetic number, because the mean of its divisors is an integer number (1000555759).

Almost surely, 2^2001111517 is an apocalyptic number.

It is an amenable number.

2001111517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001111517 is an equidigital number, since it uses as much as digits as its factorization.

2001111517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70, while the sum is 19.

The square root of 2001111517 is about 44733.7849617043. The cubic root of 2001111517 is about 1260.1544106137.

Adding to 2001111517 its reverse (7151111002), we get a palindrome (9152222519).

The spelling of 2001111517 in words is "two billion, one million, one hundred eleven thousand, five hundred seventeen".