189842332681 has 3 divisors (see below), whose sum is σ = 189842768391. Its totient is φ = 189841896972.

The previous prime is 189842332679. The next prime is 189842332807. The reversal of 189842332681 is 186233248981.

The square root of 189842332681 is 435709.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 128229164281 + 61613168400 = 358091^2 + 248220^2 .

It is not a de Polignac number, because 189842332681 - 2¹ = 189842332679 is a prime.

It is a super-2 number, since 2×189842332681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189842332651) 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 2 ways as a sum of consecutive naturals, for example, 217855 + ... + 653563.

It is an arithmetic number, because the mean of its divisors is an integer number (63280922797).

Almost surely, 2^189842332681 is an apocalyptic number.

189842332681 is the 435709-th square number.

189842332681 is the 217855-th centered octagonal number.

It is an amenable number.

189842332681 is a deficient number, since it is larger than the sum of its proper divisors (435710).

189842332681 is an frugal number, since it uses more digits than its factorization.

189842332681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871418 (or 435709 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 55.

The spelling of 189842332681 in words is "one hundred eighty-nine billion, eight hundred forty-two million, three hundred thirty-two thousand, six hundred eighty-one".