162128161 has 8 divisors (see below), whose sum is σ = 175611240. Its totient is φ = 148789632.

The previous prime is 162128147. The next prime is 162128177. The reversal of 162128161 is 161821261.

It can be written as a sum of positive squares in 4 ways, for example, as 48385936 + 113742225 = 6956^2 + 10665^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 162128161 - 2⁷ = 162128033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162128101) 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, 33796 + ... + 38293.

It is an arithmetic number, because the mean of its divisors is an integer number (21951405).

Almost surely, 2^162128161 is an apocalyptic number.

It is an amenable number.

162128161 is a deficient number, since it is larger than the sum of its proper divisors (13483079).

162128161 is a wasteful number, since it uses less digits than its factorization.

162128161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72275.

The product of its digits is 1152, while the sum is 28.

The square root of 162128161 is about 12732.9557055697. The cubic root of 162128161 is about 545.2798955079.

The spelling of 162128161 in words is "one hundred sixty-two million, one hundred twenty-eight thousand, one hundred sixty-one".