161387543 has 4 divisors (see below), whose sum is σ = 161615880. Its totient is φ = 161159208.

The previous prime is 161387509. The next prime is 161387549. The reversal of 161387543 is 345783161.

161387543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161387543 - 2¹² = 161383447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161387497 and 161387506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161387549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113105 + ... + 114522.

It is an arithmetic number, because the mean of its divisors is an integer number (40403970).

Almost surely, 2^161387543 is an apocalyptic number.

161387543 is a deficient number, since it is larger than the sum of its proper divisors (228337).

161387543 is an equidigital number, since it uses as much as digits as its factorization.

161387543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228336.

The product of its digits is 60480, while the sum is 38.

The square root of 161387543 is about 12703.8396951473. The cubic root of 161387543 is about 544.4483299073.

The spelling of 161387543 in words is "one hundred sixty-one million, three hundred eighty-seven thousand, five hundred forty-three".