11147944417 has 4 divisors (see below), whose sum is σ = 11148159940. Its totient is φ = 11147728896.

The previous prime is 11147944399. The next prime is 11147944439. The reversal of 11147944417 is 71444974111.

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 3390034176 + 7757910241 = 58224^2 + 88079^2 .

It is a 3-Lehmer number, since φ(11147944417) divides (11147944417-1)³.

It is a cyclic number.

It is not a de Polignac number, because 11147944417 - 2¹¹ = 11147942369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11147944447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21553 + ... + 150865.

It is an arithmetic number, because the mean of its divisors is an integer number (2787039985).

It is a Poulet number, since it divides 2^11147944416-1.

Almost surely, 2^11147944417 is an apocalyptic number.

11147944417 is the 86209-th pentagonal number.

It is an amenable number.

11147944417 is a deficient number, since it is larger than the sum of its proper divisors (215523).

11147944417 is an equidigital number, since it uses as much as digits as its factorization.

11147944417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215522.

The product of its digits is 112896, while the sum is 43.

The spelling of 11147944417 in words is "eleven billion, one hundred forty-seven million, nine hundred forty-four thousand, four hundred seventeen".