16209001 has 4 divisors (see below), whose sum is σ = 16731904. Its totient is φ = 15686100.

The previous prime is 16208989. The next prime is 16209019. The reversal of 16209001 is 10090261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10090261 = 23 ⋅438707.

It is a cyclic number.

It is not a de Polignac number, because 16209001 - 2⁷ = 16208873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16209001.

It is not an unprimeable number, because it can be changed into a prime (16209101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261405 + ... + 261466.

It is an arithmetic number, because the mean of its divisors is an integer number (4182976).

Almost surely, 2^16209001 is an apocalyptic number.

16209001 is the 1801-st centered decagonal number.

It is an amenable number.

16209001 is a deficient number, since it is larger than the sum of its proper divisors (522903).

16209001 is an equidigital number, since it uses as much as digits as its factorization.

16209001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522902.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 16209001 is about 4026.0403624405. The cubic root of 16209001 is about 253.0766534907.

Adding to 16209001 its reverse (10090261), we get a palindrome (26299262).

The spelling of 16209001 in words is "sixteen million, two hundred nine thousand, one".