13543709481 has 24 divisors (see below), whose sum is σ = 20733116040. Its totient is φ = 8490134016.

The previous prime is 13543709467. The next prime is 13543709483. The reversal of 13543709481 is 18490734531.

13543709481 is a `hidden beast` number, since 13 + 543 + 7 + 0 + 94 + 8 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11380622400 + 2163087081 = 106680^2 + 46509^2 .

It is not a de Polignac number, because 13543709481 - 2⁷ = 13543709353 is a prime.

It is a super-2 number, since 2×13543709481² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13543709483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126735 + ... + 207723.

It is an arithmetic number, because the mean of its divisors is an integer number (863879835).

Almost surely, 2^13543709481 is an apocalyptic number.

It is an amenable number.

13543709481 is a deficient number, since it is larger than the sum of its proper divisors (7189406559).

13543709481 is a wasteful number, since it uses less digits than its factorization.

13543709481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82105 (or 82102 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 13543709481 in words is "thirteen billion, five hundred forty-three million, seven hundred nine thousand, four hundred eighty-one".