12099591 has 16 divisors (see below), whose sum is σ = 20486400. Its totient is φ = 6913944.

The previous prime is 12099589. The next prime is 12099601. The reversal of 12099591 is 19599021.

12099591 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12099591 - 2¹ = 12099589 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12099511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31821 + ... + 32198.

It is an arithmetic number, because the mean of its divisors is an integer number (1280400).

Almost surely, 2^12099591 is an apocalyptic number.

12099591 is a deficient number, since it is larger than the sum of its proper divisors (8386809).

12099591 is an equidigital number, since it uses as much as digits as its factorization.

12099591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64035 (or 64029 counting only the distinct ones).

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

The square root of 12099591 is about 3478.4466360719. The cubic root of 12099591 is about 229.5744557429.

The spelling of 12099591 in words is "twelve million, ninety-nine thousand, five hundred ninety-one".