12591643 has 2 divisors, whose sum is σ = 12591644. Its totient is φ = 12591642.

The previous prime is 12591617. The next prime is 12591659. The reversal of 12591643 is 34619521.

It is a strong prime.

It is an emirp because it is prime and its reverse (34619521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12591643 is a prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (12591613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6295821 + 6295822.

It is an arithmetic number, because the mean of its divisors is an integer number (6295822).

Almost surely, 2^12591643 is an apocalyptic number.

12591643 is a deficient number, since it is larger than the sum of its proper divisors (1).

12591643 is an equidigital number, since it uses as much as digits as its factorization.

12591643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 12591643 is about 3548.4705155884. The cubic root of 12591643 is about 232.6452201022.

The spelling of 12591643 in words is "twelve million, five hundred ninety-one thousand, six hundred forty-three".