12555521 has 8 divisors (see below), whose sum is σ = 14169600. Its totient is φ = 11020240.

The previous prime is 12555511. The next prime is 12555547.

12555521 is nontrivially palindromic in base 10.

12555521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12555521 - 2⁶ = 12555457 is a prime.

It is a super-2 number, since 2×12555521² = 315282215162882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12555511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19361 + ... + 19998.

It is an arithmetic number, because the mean of its divisors is an integer number (1771200).

Almost surely, 2^12555521 is an apocalyptic number.

12555521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12555521 is a deficient number, since it is larger than the sum of its proper divisors (1614079).

12555521 is a wasteful number, since it uses less digits than its factorization.

12555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39399.

The product of its digits is 2500, while the sum is 26.

The square root of 12555521 is about 3543.3770615050. The cubic root of 12555521 is about 232.4225417389.

It can be divided in two parts, 1255 and 5521, that added together give a palindrome (6776).

The spelling of 12555521 in words is "twelve million, five hundred fifty-five thousand, five hundred twenty-one".