189665281 has 8 divisors (see below), whose sum is σ = 204361920. Its totient is φ = 174983952.

The previous prime is 189665279. The next prime is 189665327. The reversal of 189665281 is 182566981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189665281 - 2¹ = 189665279 is a prime.

It is a super-2 number, since 2×189665281² = 71945837633617922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189665251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46386 + ... + 50308.

It is an arithmetic number, because the mean of its divisors is an integer number (25545240).

Almost surely, 2^189665281 is an apocalyptic number.

It is an amenable number.

189665281 is a deficient number, since it is larger than the sum of its proper divisors (14696639).

189665281 is a wasteful number, since it uses less digits than its factorization.

189665281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7655.

The product of its digits is 207360, while the sum is 46.

The square root of 189665281 is about 13771.9018657555. The cubic root of 189665281 is about 574.5519190931.

The spelling of 189665281 in words is "one hundred eighty-nine million, six hundred sixty-five thousand, two hundred eighty-one".