12455521 has 12 divisors (see below), whose sum is σ = 13874196. Its totient is φ = 11115360.

The previous prime is 12455503. The next prime is 12455533. The reversal of 12455521 is 12555421.

12455521 is digitally balanced in base 2, 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 2 ways, for example, as 6305121 + 6150400 = 2511^2 + 2480^2 .

It is not a de Polignac number, because 12455521 - 2¹¹ = 12453473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12455591) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11995 + ... + 12991.

It is an arithmetic number, because the mean of its divisors is an integer number (1156183).

Almost surely, 2^12455521 is an apocalyptic number.

It is an amenable number.

12455521 is a deficient number, since it is larger than the sum of its proper divisors (1418675).

12455521 is an equidigital number, since it uses as much as digits as its factorization.

12455521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072 (or 1041 counting only the distinct ones).

The product of its digits is 2000, while the sum is 25.

The square root of 12455521 is about 3529.2380197431. The cubic root of 12455521 is about 231.8038435600.

The spelling of 12455521 in words is "twelve million, four hundred fifty-five thousand, five hundred twenty-one".