189851 has 2 divisors, whose sum is σ = 189852. Its totient is φ = 189850.

The previous prime is 189823. The next prime is 189853. The reversal of 189851 is 158981.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (158981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189851 - 2¹⁰ = 188827 is a prime.

It is a Sophie Germain prime.

Together with 189853, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189853) 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, 94925 + 94926.

It is an arithmetic number, because the mean of its divisors is an integer number (94926).

2¹⁸⁹⁸⁵¹ is an apocalyptic number.

189851 is a deficient number, since it is larger than the sum of its proper divisors (1).

189851 is an equidigital number, since it uses as much as digits as its factorization.

189851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 32.

The square root of 189851 is about 435.7189461109. The cubic root of 189851 is about 57.4739390407.

The spelling of 189851 in words is "one hundred eighty-nine thousand, eight hundred fifty-one".