189209811 has 8 divisors (see below), whose sum is σ = 288319744. Its totient is φ = 108119880.

The previous prime is 189209789. The next prime is 189209821. The reversal of 189209811 is 118902981.

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

It is not a de Polignac number, because 189209811 - 2²⁷ = 54992083 is a prime.

It is a super-3 number, since 3×189209811³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189209811.

It is not an unprimeable number, because it can be changed into a prime (189209821) 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, 4504975 + ... + 4505016.

It is an arithmetic number, because the mean of its divisors is an integer number (36039968).

Almost surely, 2^189209811 is an apocalyptic number.

189209811 is a deficient number, since it is larger than the sum of its proper divisors (99109933).

189209811 is an equidigital number, since it uses as much as digits as its factorization.

189209811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9010001.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 189209811 is about 13755.3557205912. The cubic root of 189209811 is about 574.0916329164.

The spelling of 189209811 in words is "one hundred eighty-nine million, two hundred nine thousand, eight hundred eleven".