189991115 has 8 divisors (see below), whose sum is σ = 234151440. Its totient is φ = 147884832.

The previous prime is 189991091. The next prime is 189991117. The reversal of 189991115 is 511199981.

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 189991115 - 2²² = 185796811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (189991117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 513305 + ... + 513674.

It is an arithmetic number, because the mean of its divisors is an integer number (29268930).

Almost surely, 2^189991115 is an apocalyptic number.

189991115 is a deficient number, since it is larger than the sum of its proper divisors (44160325).

189991115 is a wasteful number, since it uses less digits than its factorization.

189991115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1027021.

The product of its digits is 29160, while the sum is 44.

The square root of 189991115 is about 13783.7264554982. The cubic root of 189991115 is about 574.8807465354.

The spelling of 189991115 in words is "one hundred eighty-nine million, nine hundred ninety-one thousand, one hundred fifteen".