12155009 has 4 divisors (see below), whose sum is σ = 12176304. Its totient is φ = 12133716.

The previous prime is 12154993. The next prime is 12155021. The reversal of 12155009 is 90055121.

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.

It is a cyclic number.

It is not a de Polignac number, because 12155009 - 2⁴ = 12154993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12155029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9767 + ... + 10940.

It is an arithmetic number, because the mean of its divisors is an integer number (3044076).

Almost surely, 2^12155009 is an apocalyptic number.

It is an amenable number.

12155009 is a deficient number, since it is larger than the sum of its proper divisors (21295).

12155009 is an equidigital number, since it uses as much as digits as its factorization.

12155009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21294.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 12155009 is about 3486.4034476807. The cubic root of 12155009 is about 229.9244175089.

The spelling of 12155009 in words is "twelve million, one hundred fifty-five thousand, nine".