188831 has 2 divisors, whose sum is σ = 188832. Its totient is φ = 188830.

The previous prime is 188827. The next prime is 188833. The reversal of 188831 is 138881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 188831 - 2² = 188827 is a prime.

It is a super-2 number, since 2×188831² = 71314293122, which contains 22 as substring.

Together with 188833, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 188794 and 188803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188833) 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 as a sum of consecutive naturals, namely, 94415 + 94416.

It is an arithmetic number, because the mean of its divisors is an integer number (94416).

2¹⁸⁸⁸³¹ is an apocalyptic number.

188831 is a deficient number, since it is larger than the sum of its proper divisors (1).

188831 is an equidigital number, since it uses as much as digits as its factorization.

188831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 29.

The square root of 188831 is about 434.5468904503. The cubic root of 188831 is about 57.3708253363.

The spelling of 188831 in words is "one hundred eighty-eight thousand, eight hundred thirty-one".