189901111 has 4 divisors (see below), whose sum is σ = 190279152. Its totient is φ = 189523072.

The previous prime is 189901097. The next prime is 189901121. The reversal of 189901111 is 111109981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 189901111 - 2⁵ = 189901079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189901121) 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, 188266 + ... + 189271.

It is an arithmetic number, because the mean of its divisors is an integer number (47569788).

Almost surely, 2^189901111 is an apocalyptic number.

189901111 is a deficient number, since it is larger than the sum of its proper divisors (378041).

189901111 is an equidigital number, since it uses as much as digits as its factorization.

189901111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378040.

The product of its (nonzero) digits is 648, while the sum is 31.

The square root of 189901111 is about 13780.4612041833. The cubic root of 189901111 is about 574.7899532733.

The spelling of 189901111 in words is "one hundred eighty-nine million, nine hundred one thousand, one hundred eleven".