2001640517 has 2 divisors, whose sum is σ = 2001640518. Its totient is φ = 2001640516.

The previous prime is 2001640507. The next prime is 2001640601. The reversal of 2001640517 is 7150461002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1340584996 + 661055521 = 36614^2 + 25711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001640517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001640507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000820258 + 1000820259.

It is an arithmetic number, because the mean of its divisors is an integer number (1000820259).

Almost surely, 2^2001640517 is an apocalyptic number.

It is an amenable number.

2001640517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001640517 is an equidigital number, since it uses as much as digits as its factorization.

2001640517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 2001640517 is about 44739.6973279883. The cubic root of 2001640517 is about 1260.2654427318.

The spelling of 2001640517 in words is "two billion, one million, six hundred forty thousand, five hundred seventeen".