12009081 has 8 divisors (see below), whose sum is σ = 18299584. Its totient is φ = 6862320.

The previous prime is 12009077. The next prime is 12009091. The reversal of 12009081 is 18090021.

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

It is not a de Polignac number, because 12009081 - 2² = 12009077 is a prime.

It is a super-2 number, since 2×12009081² = 288436052929122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 571861 = 12009081 / (1 + 2 + 0 + 0 + 9 + 0 + 8 + 1).

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 7 ways as a sum of consecutive naturals, for example, 285910 + ... + 285951.

It is an arithmetic number, because the mean of its divisors is an integer number (2287448).

Almost surely, 2^12009081 is an apocalyptic number.

It is an amenable number.

12009081 is a deficient number, since it is larger than the sum of its proper divisors (6290503).

12009081 is an equidigital number, since it uses as much as digits as its factorization.

12009081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571871.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 12009081 is about 3465.4120967065. The cubic root of 12009081 is about 229.0005847827. Note that the first 3 decimals are identical.

The spelling of 12009081 in words is "twelve million, nine thousand, eighty-one".