161243543 has 8 divisors (see below), whose sum is σ = 165827088. Its totient is φ = 156717184.

The previous prime is 161243527. The next prime is 161243549. The reversal of 161243543 is 345342161.

161243543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161243543 - 2⁴ = 161243527 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 (161243549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8546 + ... + 19887.

It is an arithmetic number, because the mean of its divisors is an integer number (20728386).

Almost surely, 2^161243543 is an apocalyptic number.

161243543 is a deficient number, since it is larger than the sum of its proper divisors (4583545).

161243543 is a wasteful number, since it uses less digits than its factorization.

161243543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28593.

The product of its digits is 8640, while the sum is 29.

The square root of 161243543 is about 12698.1708525283. The cubic root of 161243543 is about 544.2863515052.

The spelling of 161243543 in words is "one hundred sixty-one million, two hundred forty-three thousand, five hundred forty-three".