12536591 has 4 divisors (see below), whose sum is σ = 12579672. Its totient is φ = 12493512.

The previous prime is 12536543. The next prime is 12536597. The reversal of 12536591 is 19563521.

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 12536591 - 2¹⁸ = 12274447 is a prime.

It is a super-2 number, since 2×12536591² = 314332227802562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12536597) 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, 21101 + ... + 21686.

It is an arithmetic number, because the mean of its divisors is an integer number (3144918).

Almost surely, 2^12536591 is an apocalyptic number.

12536591 is a deficient number, since it is larger than the sum of its proper divisors (43081).

12536591 is an equidigital number, since it uses as much as digits as its factorization.

12536591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43080.

The product of its digits is 8100, while the sum is 32.

The square root of 12536591 is about 3540.7048733268. The cubic root of 12536591 is about 232.3056749107.

The spelling of 12536591 in words is "twelve million, five hundred thirty-six thousand, five hundred ninety-one".