13691543 has 4 divisors (see below), whose sum is σ = 13949928. Its totient is φ = 13433160.

The previous prime is 13691537. The next prime is 13691549. The reversal of 13691543 is 34519631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34519631 = 37 ⋅932963.

It is an interprime number because it is at equal distance from previous prime (13691537) and next prime (13691549).

It is a cyclic number.

It is not a de Polignac number, because 13691543 - 2⁴ = 13691527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13691549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129113 + ... + 129218.

It is an arithmetic number, because the mean of its divisors is an integer number (3487482).

Almost surely, 2^13691543 is an apocalyptic number.

13691543 is a deficient number, since it is larger than the sum of its proper divisors (258385).

13691543 is an equidigital number, since it uses as much as digits as its factorization.

13691543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258384.

The product of its digits is 9720, while the sum is 32.

The square root of 13691543 is about 3700.2085076385. The cubic root of 13691543 is about 239.2310050953.

The spelling of 13691543 in words is "thirteen million, six hundred ninety-one thousand, five hundred forty-three".