189755281 has 4 divisors (see below), whose sum is σ = 190233652. Its totient is φ = 189276912.

The previous prime is 189755273. The next prime is 189755287. The reversal of 189755281 is 182557981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107308881 + 82446400 = 10359^2 + 9080^2 .

It is a cyclic number.

It is not a de Polignac number, because 189755281 - 2³ = 189755273 is a prime.

It is a super-2 number, since 2×189755281² = 72014133334777922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189755287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238590 + ... + 239383.

It is an arithmetic number, because the mean of its divisors is an integer number (47558413).

Almost surely, 2^189755281 is an apocalyptic number.

It is an amenable number.

189755281 is a deficient number, since it is larger than the sum of its proper divisors (478371).

189755281 is an equidigital number, since it uses as much as digits as its factorization.

189755281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478370.

The product of its digits is 201600, while the sum is 46.

The square root of 189755281 is about 13775.1690007782. The cubic root of 189755281 is about 574.6427835457.

It can be divided in two parts, 189755 and 281, that added together give a triangular number (190036 = T₆₁₆).

The spelling of 189755281 in words is "one hundred eighty-nine million, seven hundred fifty-five thousand, two hundred eighty-one".