190911009 has 8 divisors (see below), whose sum is σ = 261427840. Its totient is φ = 123834096.

The previous prime is 190910981. The next prime is 190911011. The reversal of 190911009 is 900119091.

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

It is not a de Polignac number, because 190911009 - 2²⁰ = 189862433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190911059) 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, 859849 + ... + 860070.

It is an arithmetic number, because the mean of its divisors is an integer number (32678480).

Almost surely, 2^190911009 is an apocalyptic number.

It is an amenable number.

190911009 is a deficient number, since it is larger than the sum of its proper divisors (70516831).

190911009 is a wasteful number, since it uses less digits than its factorization.

190911009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719959.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 190911009 is about 13817.0550045949. The cubic root of 190911009 is about 575.8070673042.

It can be divided in two parts, 19091 and 1009, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 190911009 in words is "one hundred ninety million, nine hundred eleven thousand, nine".