189271112809 has 9 divisors (see below), whose sum is σ = 191732092797. Its totient is φ = 186841341804.

The previous prime is 189271112783. The next prime is 189271112851. The reversal of 189271112809 is 908211172981.

The square root of 189271112809 is 435053.

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

It is not a de Polignac number, because 189271112809 - 2¹¹ = 189271110761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189271113809) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 34366434 + ... + 34371940.

Almost surely, 2^189271112809 is an apocalyptic number.

189271112809 is the 435053-rd square number.

189271112809 is the 217527-th centered octagonal number.

It is an amenable number.

189271112809 is a deficient number, since it is larger than the sum of its proper divisors (2460979988).

189271112809 is an frugal number, since it uses more digits than its factorization.

189271112809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11172 (or 5586 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 49.

Multiplying 189271112809 by its sum of digits (49), we get a square (9274284527641 = 3045371²).

The spelling of 189271112809 in words is "one hundred eighty-nine billion, two hundred seventy-one million, one hundred twelve thousand, eight hundred nine".