11545731217 has 4 divisors (see below), whose sum is σ = 11569835520. Its totient is φ = 11521626916.

The previous prime is 11545731209. The next prime is 11545731247. The reversal of 11545731217 is 71213754511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71213754511 = 17 ⋅4189044383.

It is a cyclic number.

It is not a de Polignac number, because 11545731217 - 2³ = 11545731209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11545731247) 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, 12051433 + ... + 12052390.

It is an arithmetic number, because the mean of its divisors is an integer number (2892458880).

Almost surely, 2^11545731217 is an apocalyptic number.

It is an amenable number.

11545731217 is a deficient number, since it is larger than the sum of its proper divisors (24104303).

11545731217 is an equidigital number, since it uses as much as digits as its factorization.

11545731217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24104302.

The product of its digits is 29400, while the sum is 37.

The spelling of 11545731217 in words is "eleven billion, five hundred forty-five million, seven hundred thirty-one thousand, two hundred seventeen".