189219811 has 4 divisors (see below), whose sum is σ = 206421624. Its totient is φ = 172018000.

The previous prime is 189219799. The next prime is 189219817. The reversal of 189219811 is 118912981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118912981 = 11 ⋅10810271.

It is not a de Polignac number, because 189219811 - 2¹³ = 189211619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189219817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8600890 + ... + 8600911.

It is an arithmetic number, because the mean of its divisors is an integer number (51605406).

Almost surely, 2^189219811 is an apocalyptic number.

189219811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

189219811 is a deficient number, since it is larger than the sum of its proper divisors (17201813).

189219811 is a wasteful number, since it uses less digits than its factorization.

189219811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17201812.

The product of its digits is 10368, while the sum is 40.

The square root of 189219811 is about 13755.7192105684. The cubic root of 189219811 is about 574.1017465836.

The spelling of 189219811 in words is "one hundred eighty-nine million, two hundred nineteen thousand, eight hundred eleven".