188081 has 6 divisors (see below), whose sum is σ = 198882. Its totient is φ = 177840.

The previous prime is 188029. The next prime is 188107. The reversal of 188081 is 180881.

It can be written as a sum of positive squares in only one way, i.e., 144400 + 43681 = 380^2 + 209^2 .

It is not a de Polignac number, because 188081 - 2⁶ = 188017 is a prime.

It is a super-2 number, since 2×188081² = 70748925122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 188081.

It is not an unprimeable number, because it can be changed into a prime (188011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101 + ... + 621.

It is an arithmetic number, because the mean of its divisors is an integer number (33147).

2¹⁸⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

188081 is a deficient number, since it is larger than the sum of its proper divisors (10801).

188081 is an equidigital number, since it uses as much as digits as its factorization.

188081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 540 counting only the distinct ones).

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

The square root of 188081 is about 433.6830639995. The cubic root of 188081 is about 57.2947693012.

The spelling of 188081 in words is "one hundred eighty-eight thousand, eighty-one".