180881 has 4 divisors (see below), whose sum is σ = 181812. Its totient is φ = 179952.

The previous prime is 180871. The next prime is 180883. The reversal of 180881 is 188081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 36481 + 144400 = 191^2 + 380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180881 is a prime.

It is a super-2 number, since 2×180881² = 65435872322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 180881.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 180881.

It is not an unprimeable number, because it can be changed into a prime (180883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 603.

It is an arithmetic number, because the mean of its divisors is an integer number (45453).

2¹⁸⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

180881 is a deficient number, since it is larger than the sum of its proper divisors (931).

180881 is an equidigital number, since it uses as much as digits as its factorization.

180881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930.

The product of its (nonzero) digits is 512, while the sum is 26.

The square root of 180881 is about 425.3010698317. The cubic root of 180881 is about 56.5541288243.

The spelling of 180881 in words is "one hundred eighty thousand, eight hundred eighty-one".