12328591 has 4 divisors (see below), whose sum is σ = 13449384. Its totient is φ = 11207800.

The previous prime is 12328583. The next prime is 12328601. The reversal of 12328591 is 19582321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12328591 - 2³ = 12328583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12328531) 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, 560380 + ... + 560401.

It is an arithmetic number, because the mean of its divisors is an integer number (3362346).

Almost surely, 2^12328591 is an apocalyptic number.

12328591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12328591 is a deficient number, since it is larger than the sum of its proper divisors (1120793).

12328591 is a wasteful number, since it uses less digits than its factorization.

12328591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120792.

The product of its digits is 4320, while the sum is 31.

The square root of 12328591 is about 3511.2093358272. The cubic root of 12328591 is about 231.0137420534.

The spelling of 12328591 in words is "twelve million, three hundred twenty-eight thousand, five hundred ninety-one".