12901209 has 8 divisors (see below), whose sum is σ = 18107040. Its totient is φ = 8148096.

The previous prime is 12901199. The next prime is 12901223. The reversal of 12901209 is 90210921.

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

It is not a de Polignac number, because 12901209 - 2⁴ = 12901193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12901279) 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 7 ways as a sum of consecutive naturals, for example, 113112 + ... + 113225.

It is an arithmetic number, because the mean of its divisors is an integer number (2263380).

Almost surely, 2^12901209 is an apocalyptic number.

12901209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12901209 is a deficient number, since it is larger than the sum of its proper divisors (5205831).

12901209 is a wasteful number, since it uses less digits than its factorization.

12901209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226359.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 12901209 is about 3591.8253019878. The cubic root of 12901209 is about 234.5363364178.

The spelling of 12901209 in words is "twelve million, nine hundred one thousand, two hundred nine".