188661 has 8 divisors (see below), whose sum is σ = 274464. Its totient is φ = 114320.

The previous prime is 188653. The next prime is 188677. The reversal of 188661 is 166881.

188661 is nontrivially palindromic in base 12.

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 188661 - 2³ = 188653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188621) 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, 2826 + ... + 2891.

It is an arithmetic number, because the mean of its divisors is an integer number (34308).

2¹⁸⁸⁶⁶¹ is an apocalyptic number.

188661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

188661 is a deficient number, since it is larger than the sum of its proper divisors (85803).

188661 is a wasteful number, since it uses less digits than its factorization.

188661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5731.

The product of its digits is 2304, while the sum is 30.

The square root of 188661 is about 434.3512403574. The cubic root of 188661 is about 57.3536036432.

The spelling of 188661 in words is "one hundred eighty-eight thousand, six hundred sixty-one".