9916812511 has 2 divisors, whose sum is σ = 9916812512. Its totient is φ = 9916812510.

The previous prime is 9916812497. The next prime is 9916812553. The reversal of 9916812511 is 1152186199.

It is a weak prime.

It is an emirp because it is prime and its reverse (1152186199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9916812511 - 2²¹ = 9914715359 is a prime.

It is a super-2 number, since 2×9916812511² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9916812811) 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, 4958406255 + 4958406256.

It is an arithmetic number, because the mean of its divisors is an integer number (4958406256).

Almost surely, 2^9916812511 is an apocalyptic number.

9916812511 is a deficient number, since it is larger than the sum of its proper divisors (1).

9916812511 is an equidigital number, since it uses as much as digits as its factorization.

9916812511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 43.

The square root of 9916812511 is about 99583.1939184519. The cubic root of 9916812511 is about 2148.4439803892.

The spelling of 9916812511 in words is "nine billion, nine hundred sixteen million, eight hundred twelve thousand, five hundred eleven".