189128911 has 8 divisors (see below), whose sum is σ = 193129344. Its totient is φ = 185166720.

The previous prime is 189128903. The next prime is 189128917. The reversal of 189128911 is 119821981.

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

It is a cyclic number.

It is not a de Polignac number, because 189128911 - 2³ = 189128903 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 (189128917) 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, 546 + ... + 19456.

It is an arithmetic number, because the mean of its divisors is an integer number (24141168).

Almost surely, 2^189128911 is an apocalyptic number.

189128911 is a deficient number, since it is larger than the sum of its proper divisors (4000433).

189128911 is a wasteful number, since it uses less digits than its factorization.

189128911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19121.

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

The square root of 189128911 is about 13752.4147334205. The cubic root of 189128911 is about 574.0098002430.

The spelling of 189128911 in words is "one hundred eighty-nine million, one hundred twenty-eight thousand, nine hundred eleven".