9911980187 has 2 divisors, whose sum is σ = 9911980188. Its totient is φ = 9911980186.

The previous prime is 9911980171. The next prime is 9911980213. The reversal of 9911980187 is 7810891199.

9911980187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (7810891199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9911980187 - 2⁴ = 9911980171 is a prime.

It is not a weakly prime, because it can be changed into another prime (9911980787) 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, 4955990093 + 4955990094.

It is an arithmetic number, because the mean of its divisors is an integer number (4955990094).

Almost surely, 2^9911980187 is an apocalyptic number.

9911980187 is a deficient number, since it is larger than the sum of its proper divisors (1).

9911980187 is an equidigital number, since it uses as much as digits as its factorization.

9911980187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 53.

The square root of 9911980187 is about 99558.9282133953. The cubic root of 9911980187 is about 2148.0949547930.

The spelling of 9911980187 in words is "nine billion, nine hundred eleven million, nine hundred eighty thousand, one hundred eighty-seven".