12912591 has 8 divisors (see below), whose sum is σ = 17965440. Its totient is φ = 8234072.

The previous prime is 12912589. The next prime is 12912619. The reversal of 12912591 is 19521921.

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

It is a cyclic number.

It is not a de Polignac number, because 12912591 - 2¹ = 12912589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12912551) 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, 93501 + ... + 93638.

It is an arithmetic number, because the mean of its divisors is an integer number (2245680).

Almost surely, 2^12912591 is an apocalyptic number.

12912591 is a deficient number, since it is larger than the sum of its proper divisors (5052849).

12912591 is a wasteful number, since it uses less digits than its factorization.

12912591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187165.

The product of its digits is 1620, while the sum is 30.

The square root of 12912591 is about 3593.4093838582. The cubic root of 12912591 is about 234.6052888165.

It can be divided in two parts, 129 and 12591, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 12912591 in words is "twelve million, nine hundred twelve thousand, five hundred ninety-one".