189186643 has 2 divisors, whose sum is σ = 189186644. Its totient is φ = 189186642.

The previous prime is 189186637. The next prime is 189186653. The reversal of 189186643 is 346681981.

It is a weak prime.

It is an emirp because it is prime and its reverse (346681981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189186643 - 2¹⁷ = 189055571 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 189186593 and 189186602.

It is not a weakly prime, because it can be changed into another prime (189186653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94593321 + 94593322.

It is an arithmetic number, because the mean of its divisors is an integer number (94593322).

Almost surely, 2^189186643 is an apocalyptic number.

189186643 is a deficient number, since it is larger than the sum of its proper divisors (1).

189186643 is an equidigital number, since it uses as much as digits as its factorization.

189186643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 189186643 is about 13754.5135501042. The cubic root of 189186643 is about 574.0682002029.

The spelling of 189186643 in words is "one hundred eighty-nine million, one hundred eighty-six thousand, six hundred forty-three".