11543985481 has 16 divisors (see below), whose sum is σ = 13285987200. Its totient is φ = 9825360768.

The previous prime is 11543985469. The next prime is 11543985517. The reversal of 11543985481 is 18458934511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11543985481 is a prime.

It is a super-2 number, since 2×11543985481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11543985181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 912165 + ... + 924733.

It is an arithmetic number, because the mean of its divisors is an integer number (830374200).

Almost surely, 2^11543985481 is an apocalyptic number.

It is an amenable number.

11543985481 is a deficient number, since it is larger than the sum of its proper divisors (1742001719).

11543985481 is a wasteful number, since it uses less digits than its factorization.

11543985481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488.

The product of its digits is 691200, while the sum is 49.

The spelling of 11543985481 in words is "eleven billion, five hundred forty-three million, nine hundred eighty-five thousand, four hundred eighty-one".