16391009 has 8 divisors (see below), whose sum is σ = 17519328. Its totient is φ = 15280960.

The previous prime is 16390993. The next prime is 16391017. The reversal of 16391009 is 90019361.

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

It is not a de Polignac number, because 16391009 - 2⁴ = 16390993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16391029) 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, 2687 + ... + 6324.

It is an arithmetic number, because the mean of its divisors is an integer number (2189916).

Almost surely, 2^16391009 is an apocalyptic number.

It is an amenable number.

16391009 is a deficient number, since it is larger than the sum of its proper divisors (1128319).

16391009 is a wasteful number, since it uses less digits than its factorization.

16391009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9135.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 16391009 is about 4048.5811094753. The cubic root of 16391009 is about 254.0203809054.

The spelling of 16391009 in words is "sixteen million, three hundred ninety-one thousand, nine".