16357009 has 4 divisors (see below), whose sum is σ = 17319204. Its totient is φ = 15394816.

The previous prime is 16357001. The next prime is 16357021. The reversal of 16357009 is 90075361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90075361 = 331 ⋅272131.

It can be written as a sum of positive squares in 2 ways, for example, as 8673025 + 7683984 = 2945^2 + 2772^2 .

It is a cyclic number.

It is not a de Polignac number, because 16357009 - 2³ = 16357001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16357001) 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 3 ways as a sum of consecutive naturals, for example, 481072 + ... + 481105.

It is an arithmetic number, because the mean of its divisors is an integer number (4329801).

Almost surely, 2^16357009 is an apocalyptic number.

It is an amenable number.

16357009 is a deficient number, since it is larger than the sum of its proper divisors (962195).

16357009 is an equidigital number, since it uses as much as digits as its factorization.

16357009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962194.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 16357009 is about 4044.3799277516. The cubic root of 16357009 is about 253.8446204918.

The spelling of 16357009 in words is "sixteen million, three hundred fifty-seven thousand, nine".