11910581005 has 4 divisors (see below), whose sum is σ = 14292697212. Its totient is φ = 9528464800.

The previous prime is 11910581003. The next prime is 11910581029. The reversal of 11910581005 is 50018501911.

11910581005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5197400649 + 6713180356 = 72093^2 + 81934^2 .

It is not a de Polignac number, because 11910581005 - 2¹ = 11910581003 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11910581003) 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 in 3 ways as a sum of consecutive naturals, for example, 1191058096 + ... + 1191058105.

It is an arithmetic number, because the mean of its divisors is an integer number (3573174303).

Almost surely, 2^11910581005 is an apocalyptic number.

It is an amenable number.

11910581005 is a deficient number, since it is larger than the sum of its proper divisors (2382116207).

11910581005 is an equidigital number, since it uses as much as digits as its factorization.

11910581005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382116206.

The product of its (nonzero) digits is 1800, while the sum is 31.

The spelling of 11910581005 in words is "eleven billion, nine hundred ten million, five hundred eighty-one thousand, five".