11505513103 has 4 divisors (see below), whose sum is σ = 13149157840. Its totient is φ = 9861868368.

The previous prime is 11505513059. The next prime is 11505513127. The reversal of 11505513103 is 30131550511.

It is a happy number.

11505513103 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 is a cyclic number.

It is not a de Polignac number, because 11505513103 - 2⁹ = 11505512591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11505513163) 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, 821822358 + ... + 821822371.

It is an arithmetic number, because the mean of its divisors is an integer number (3287289460).

Almost surely, 2^11505513103 is an apocalyptic number.

11505513103 is a deficient number, since it is larger than the sum of its proper divisors (1643644737).

11505513103 is an equidigital number, since it uses as much as digits as its factorization.

11505513103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643644736.

The product of its (nonzero) digits is 1125, while the sum is 25.

The spelling of 11505513103 in words is "eleven billion, five hundred five million, five hundred thirteen thousand, one hundred three".