11543140181 has 4 divisors (see below), whose sum is σ = 11561849292. Its totient is φ = 11524431072.

The previous prime is 11543140171. The next prime is 11543140183. The reversal of 11543140181 is 18104134511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18104134511 = 3061 ⋅5914451.

It can be written as a sum of positive squares in 2 ways, for example, as 6378418225 + 5164721956 = 79865^2 + 71866^2 .

It is a cyclic number.

It is not a de Polignac number, because 11543140181 - 2²⁶ = 11476031317 is a prime.

It is a super-2 number, since 2×11543140181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11543140183) 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, 9353630 + ... + 9354863.

It is an arithmetic number, because the mean of its divisors is an integer number (2890462323).

Almost surely, 2^11543140181 is an apocalyptic number.

It is an amenable number.

11543140181 is a deficient number, since it is larger than the sum of its proper divisors (18709111).

11543140181 is an equidigital number, since it uses as much as digits as its factorization.

11543140181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18709110.

The product of its (nonzero) digits is 1920, while the sum is 29.

Adding to 11543140181 its reverse (18104134511), we get a palindrome (29647274692).

The spelling of 11543140181 in words is "eleven billion, five hundred forty-three million, one hundred forty thousand, one hundred eighty-one".