189500890489 has 3 divisors (see below), whose sum is σ = 189501325807. Its totient is φ = 189500455172.

The previous prime is 189500890483. The next prime is 189500890511. The reversal of 189500890489 is 984098005981.

The square root of 189500890489 is 435317.

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

189500890489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 984098005981 = 513347 ⋅1917023.

It can be written as a sum of positive squares in only one way, i.e., 45030962025 + 144469928464 = 212205^2 + 380092^2 .

It is not a de Polignac number, because 189500890489 - 2¹⁷ = 189500759417 is a prime.

It is a super-2 number, since 2×189500890489² (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 (189500890483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 217659 + ... + 652975.

Almost surely, 2^189500890489 is an apocalyptic number.

189500890489 is the 435317-th square number.

189500890489 is the 217659-th centered octagonal number.

It is an amenable number.

189500890489 is a deficient number, since it is larger than the sum of its proper divisors (435318).

189500890489 is an frugal number, since it uses more digits than its factorization.

189500890489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870634 (or 435317 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 61.

The spelling of 189500890489 in words is "one hundred eighty-nine billion, five hundred million, eight hundred ninety thousand, four hundred eighty-nine".