188531 has 8 divisors (see below), whose sum is σ = 225024. Its totient is φ = 154440.

The previous prime is 188527. The next prime is 188533. The reversal of 188531 is 135881.

188531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 188531 - 2² = 188527 is a prime.

It is a super-2 number, since 2×188531² = 71087875922, 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 188531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188533) 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, 425 + ... + 746.

It is an arithmetic number, because the mean of its divisors is an integer number (28128).

2¹⁸⁸⁵³¹ is an apocalyptic number.

188531 is a deficient number, since it is larger than the sum of its proper divisors (36493).

188531 is a wasteful number, since it uses less digits than its factorization.

188531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201.

The product of its digits is 960, while the sum is 26.

The square root of 188531 is about 434.2015660957. The cubic root of 188531 is about 57.3404271314.

Subtracting from 188531 its reverse (135881), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 188531 in words is "one hundred eighty-eight thousand, five hundred thirty-one".