11005551187 has 2 divisors, whose sum is σ = 11005551188. Its totient is φ = 11005551186.

The previous prime is 11005551097. The next prime is 11005551199. The reversal of 11005551187 is 78115550011.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (78115550011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11005551187 - 2¹⁹ = 11005026899 is a prime.

It is a super-2 number, since 2×11005551187² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11005557187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5502775593 + 5502775594.

It is an arithmetic number, because the mean of its divisors is an integer number (5502775594).

Almost surely, 2^11005551187 is an apocalyptic number.

11005551187 is a deficient number, since it is larger than the sum of its proper divisors (1).

11005551187 is an equidigital number, since it uses as much as digits as its factorization.

11005551187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7000, while the sum is 34.

The spelling of 11005551187 in words is "eleven billion, five million, five hundred fifty-one thousand, one hundred eighty-seven".