191449009 has 8 divisors (see below), whose sum is σ = 193596480. Its totient is φ = 189312816.

The previous prime is 191448979. The next prime is 191449021. The reversal of 191449009 is 900944191.

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 191449009 - 2⁵ = 191448977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191449099) 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, 33939 + ... + 39175.

It is an arithmetic number, because the mean of its divisors is an integer number (24199560).

Almost surely, 2^191449009 is an apocalyptic number.

It is an amenable number.

191449009 is a deficient number, since it is larger than the sum of its proper divisors (2147471).

191449009 is a wasteful number, since it uses less digits than its factorization.

191449009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5639.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 191449009 is about 13836.5100007191. The cubic root of 191449009 is about 576.3474476295.

The spelling of 191449009 in words is "one hundred ninety-one million, four hundred forty-nine thousand, nine".