191112289 has 8 divisors (see below), whose sum is σ = 197368808. Its totient is φ = 184913280.

The previous prime is 191112263. The next prime is 191112307. The reversal of 191112289 is 982211191.

It can be written as a sum of positive squares in 4 ways, for example, as 893025 + 190219264 = 945^2 + 13792^2 .

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 191112289 - 2⁷ = 191112161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191113289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7572 + ... + 20965.

It is an arithmetic number, because the mean of its divisors is an integer number (24671101).

Almost surely, 2^191112289 is an apocalyptic number.

It is an amenable number.

191112289 is a deficient number, since it is larger than the sum of its proper divisors (6256519).

191112289 is a wasteful number, since it uses less digits than its factorization.

191112289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28755.

The product of its digits is 2592, while the sum is 34.

The square root of 191112289 is about 13824.3368376208. The cubic root of 191112289 is about 576.0093565626.

The spelling of 191112289 in words is "one hundred ninety-one million, one hundred twelve thousand, two hundred eighty-nine".