169409543 has 4 divisors (see below), whose sum is σ = 169435728. Its totient is φ = 169383360.

The previous prime is 169409533. The next prime is 169409549. The reversal of 169409543 is 345904961.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 345904961 = 1999 ⋅173039.

It is a cyclic number.

It is not a de Polignac number, because 169409543 - 2²⁰ = 168360967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 169409543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169409549) 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, 4430 + ... + 18932.

It is an arithmetic number, because the mean of its divisors is an integer number (42358932).

Almost surely, 2^169409543 is an apocalyptic number.

169409543 is a deficient number, since it is larger than the sum of its proper divisors (26185).

169409543 is a wasteful number, since it uses less digits than its factorization.

169409543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26184.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 169409543 is about 13015.7421225222. The cubic root of 169409543 is about 553.3237228779.

The spelling of 169409543 in words is "one hundred sixty-nine million, four hundred nine thousand, five hundred forty-three".