161081 has 4 divisors (see below), whose sum is σ = 163200. Its totient is φ = 158964.

The previous prime is 161071. The next prime is 161087. The reversal of 161081 is 180161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161081 - 2⁶ = 161017 is a prime.

It is a super-2 number, since 2×161081² = 51894177122, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161081.

It is not an unprimeable number, because it can be changed into a prime (161087) 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, 941 + ... + 1098.

It is an arithmetic number, because the mean of its divisors is an integer number (40800).

2¹⁶¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

161081 is a deficient number, since it is larger than the sum of its proper divisors (2119).

161081 is an equidigital number, since it uses as much as digits as its factorization.

161081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 161081 is about 401.3489753319. The cubic root of 161081 is about 54.4103399103.

The spelling of 161081 in words is "one hundred sixty-one thousand, eighty-one".