11217471847 has 4 divisors (see below), whose sum is σ = 11218078816. Its totient is φ = 11216864880.

The previous prime is 11217471827. The next prime is 11217471857. The reversal of 11217471847 is 74817471211.

11217471847 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 a de Polignac number, because none of the positive numbers 2^k-11217471847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11217471827) 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, 274863 + ... + 313024.

It is an arithmetic number, because the mean of its divisors is an integer number (2804519704).

Almost surely, 2^11217471847 is an apocalyptic number.

11217471847 is a deficient number, since it is larger than the sum of its proper divisors (606969).

11217471847 is an equidigital number, since it uses as much as digits as its factorization.

11217471847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606968.

The product of its digits is 87808, while the sum is 43.

The spelling of 11217471847 in words is "eleven billion, two hundred seventeen million, four hundred seventy-one thousand, eight hundred forty-seven".