11005981123 has 2 divisors, whose sum is σ = 11005981124. Its totient is φ = 11005981122.

The previous prime is 11005981109. The next prime is 11005981141. The reversal of 11005981123 is 32118950011.

It is a weak prime.

It is an emirp because it is prime and its reverse (32118950011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11005981123 - 2⁹ = 11005980611 is a prime.

It is a super-2 number, since 2×11005981123² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11005981153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5502990561 + 5502990562.

It is an arithmetic number, because the mean of its divisors is an integer number (5502990562).

Almost surely, 2^11005981123 is an apocalyptic number.

11005981123 is a deficient number, since it is larger than the sum of its proper divisors (1).

11005981123 is an equidigital number, since it uses as much as digits as its factorization.

11005981123 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 31.

The spelling of 11005981123 in words is "eleven billion, five million, nine hundred eighty-one thousand, one hundred twenty-three".