12909591 has 16 divisors (see below), whose sum is σ = 19180800. Its totient is φ = 8581464.

The previous prime is 12909587. The next prime is 12909593. The reversal of 12909591 is 19590921.

It is not a de Polignac number, because 12909591 - 2² = 12909587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12909593) 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 15 ways as a sum of consecutive naturals, for example, 17100 + ... + 17838.

It is an arithmetic number, because the mean of its divisors is an integer number (1198800).

Almost surely, 2^12909591 is an apocalyptic number.

12909591 is a deficient number, since it is larger than the sum of its proper divisors (6271209).

12909591 is an equidigital number, since it uses as much as digits as its factorization.

12909591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395 (or 1389 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 12909591 is about 3592.9919287413. The cubic root of 12909591 is about 234.5871186862.

The spelling of 12909591 in words is "twelve million, nine hundred nine thousand, five hundred ninety-one".