12591553 has 8 divisors (see below), whose sum is σ = 13621608. Its totient is φ = 11570304.

The previous prime is 12591503. The next prime is 12591563. The reversal of 12591553 is 35519521.

12591553 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3249 + 12588304 = 57^2 + 3548^2 .

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 12591553 - 2⁹ = 12591041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12591503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 951 + ... + 5107.

It is an arithmetic number, because the mean of its divisors is an integer number (1702701).

Almost surely, 2^12591553 is an apocalyptic number.

12591553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

12591553 is a deficient number, since it is larger than the sum of its proper divisors (1030055).

12591553 is a wasteful number, since it uses less digits than its factorization.

12591553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403.

The product of its digits is 6750, while the sum is 31.

The square root of 12591553 is about 3548.4578340457. The cubic root of 12591553 is about 232.6446658160.

The spelling of 12591553 in words is "twelve million, five hundred ninety-one thousand, five hundred fifty-three".