189661911 has 8 divisors (see below), whose sum is σ = 267758064. Its totient is φ = 119003520.

The previous prime is 189661909. The next prime is 189661919. The reversal of 189661911 is 119166981.

It is a happy number.

189661911 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 189661911 - 2¹ = 189661909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189661919) 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, 1859380 + ... + 1859481.

It is an arithmetic number, because the mean of its divisors is an integer number (33469758).

Almost surely, 2^189661911 is an apocalyptic number.

189661911 is a deficient number, since it is larger than the sum of its proper divisors (78096153).

189661911 is a wasteful number, since it uses less digits than its factorization.

189661911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3718881.

The product of its digits is 23328, while the sum is 42.

The square root of 189661911 is about 13771.7795146452. The cubic root of 189661911 is about 574.5485161659.

The spelling of 189661911 in words is "one hundred eighty-nine million, six hundred sixty-one thousand, nine hundred eleven".