12009001 has 4 divisors (see below), whose sum is σ = 12128004. Its totient is φ = 11890000.

The previous prime is 12008999. The next prime is 12009031. The reversal of 12009001 is 10090021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10090021 = 109 ⋅92569.

It can be written as a sum of positive squares in 2 ways, for example, as 8696601 + 3312400 = 2949^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 12009001 - 2¹ = 12008999 is a prime.

It is a super-2 number, since 2×12009001² = 288432210036002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12009031) 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, 59350 + ... + 59551.

It is an arithmetic number, because the mean of its divisors is an integer number (3032001).

Almost surely, 2^12009001 is an apocalyptic number.

It is an amenable number.

12009001 is a deficient number, since it is larger than the sum of its proper divisors (119003).

12009001 is a wasteful number, since it uses less digits than its factorization.

12009001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119002.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 12009001 is about 3465.4005540486. The cubic root of 12009001 is about 229.0000762762. Note that the first 4 decimals are identical.

Adding to 12009001 its reverse (10090021), we get a palindrome (22099022).

It can be divided in two parts, 1200 and 9001, that added together give a palindrome (10201).

The spelling of 12009001 in words is "twelve million, nine thousand, one".