11447609781 has 8 divisors (see below), whose sum is σ = 15434979840. Its totient is φ = 7545989792.

The previous prime is 11447609759. The next prime is 11447609791. The reversal of 11447609781 is 18790674411.

11447609781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11447609781 - 2¹⁴ = 11447593397 is a prime.

It is a super-2 number, since 2×11447609781² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11447609781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11447609731) 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 7 ways as a sum of consecutive naturals, for example, 21437205 + ... + 21437738.

It is an arithmetic number, because the mean of its divisors is an integer number (1929372480).

Almost surely, 2^11447609781 is an apocalyptic number.

It is an amenable number.

11447609781 is a deficient number, since it is larger than the sum of its proper divisors (3987370059).

11447609781 is an equidigital number, since it uses as much as digits as its factorization.

11447609781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42875035.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 11447609781 in words is "eleven billion, four hundred forty-seven million, six hundred nine thousand, seven hundred eighty-one".