188491 has 2 divisors, whose sum is σ = 188492. Its totient is φ = 188490.

The previous prime is 188483. The next prime is 188519. The reversal of 188491 is 194881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 188491 - 2³ = 188483 is a prime.

It is not a weakly prime, because it can be changed into another prime (188401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94245 + 94246.

It is an arithmetic number, because the mean of its divisors is an integer number (94246).

2¹⁸⁸⁴⁹¹ is an apocalyptic number.

188491 is a deficient number, since it is larger than the sum of its proper divisors (1).

188491 is an equidigital number, since it uses as much as digits as its factorization.

188491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 31.

The square root of 188491 is about 434.1555020957. The cubic root of 188491 is about 57.3363716015.

The spelling of 188491 in words is "one hundred eighty-eight thousand, four hundred ninety-one".