12909081 has 4 divisors (see below), whose sum is σ = 17212112. Its totient is φ = 8606052.

The previous prime is 12909077. The next prime is 12909097. The reversal of 12909081 is 18090921.

12909081 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 12909081 - 2² = 12909077 is a prime.

It is a super-2 number, since 2×12909081² = 333288744529122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12901081) 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, 2151511 + ... + 2151516.

It is an arithmetic number, because the mean of its divisors is an integer number (4303028).

Almost surely, 2^12909081 is an apocalyptic number.

It is an amenable number.

12909081 is a deficient number, since it is larger than the sum of its proper divisors (4303031).

12909081 is an equidigital number, since it uses as much as digits as its factorization.

12909081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4303030.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 12909081 is about 3592.9209565478. The cubic root of 12909081 is about 234.5840294842.

The spelling of 12909081 in words is "twelve million, nine hundred nine thousand, eighty-one".