13439540691 has 12 divisors (see below), whose sum is σ = 19646558568. Its totient is φ = 8851745184.

The previous prime is 13439540687. The next prime is 13439540729. The reversal of 13439540691 is 19604593431.

13439540691 is a `hidden beast` number, since 1 + 3 + 43 + 9 + 540 + 69 + 1 = 666.

13439540691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13439540691 - 2² = 13439540687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13439541691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8994930 + ... + 8996423.

It is an arithmetic number, because the mean of its divisors is an integer number (1637213214).

Almost surely, 2^13439540691 is an apocalyptic number.

13439540691 is a deficient number, since it is larger than the sum of its proper divisors (6207017877).

13439540691 is a wasteful number, since it uses less digits than its factorization.

13439540691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17991442 (or 17991439 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 13439540691 in words is "thirteen billion, four hundred thirty-nine million, five hundred forty thousand, six hundred ninety-one".