161728141 has 4 divisors (see below), whose sum is σ = 164379484. Its totient is φ = 159076800.

The previous prime is 161728139. The next prime is 161728159. The reversal of 161728141 is 141827161.

161728141 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, and also an emirpimes, since its reverse is a distinct semiprime: 141827161 = 7 ⋅20261023.

It can be written as a sum of positive squares in 2 ways, for example, as 3496900 + 158231241 = 1870^2 + 12579^2 .

It is a cyclic number.

It is not a de Polignac number, because 161728141 - 2¹ = 161728139 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 (161728181) 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, 1325580 + ... + 1325701.

It is an arithmetic number, because the mean of its divisors is an integer number (41094871).

Almost surely, 2^161728141 is an apocalyptic number.

It is an amenable number.

161728141 is a deficient number, since it is larger than the sum of its proper divisors (2651343).

161728141 is an equidigital number, since it uses as much as digits as its factorization.

161728141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651342.

The product of its digits is 2688, while the sum is 31.

The square root of 161728141 is about 12717.2379469758. The cubic root of 161728141 is about 544.8310684796.

The spelling of 161728141 in words is "one hundred sixty-one million, seven hundred twenty-eight thousand, one hundred forty-one".