6516006121 has 2 divisors, whose sum is σ = 6516006122. Its totient is φ = 6516006120.

The previous prime is 6516006097. The next prime is 6516006181. The reversal of 6516006121 is 1216006156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5023265625 + 1492740496 = 70875^2 + 38636^2 .

It is a cyclic number.

It is not a de Polignac number, because 6516006121 - 2⁹ = 6516005609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6516006121.

It is not a weakly prime, because it can be changed into another prime (6516006181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3258003060 + 3258003061.

It is an arithmetic number, because the mean of its divisors is an integer number (3258003061).

Almost surely, 2^6516006121 is an apocalyptic number.

It is an amenable number.

6516006121 is a deficient number, since it is larger than the sum of its proper divisors (1).

6516006121 is an equidigital number, since it uses as much as digits as its factorization.

6516006121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 6516006121 is about 80721.7821966289. The cubic root of 6516006121 is about 1867.7861951654.

It can be divided in two parts, 651600 and 6121, that added together give a square (657721 = 811²).

The spelling of 6516006121 in words is "six billion, five hundred sixteen million, six thousand, one hundred twenty-one".