12375521 has 4 divisors (see below), whose sum is σ = 12419844. Its totient is φ = 12331200.

The previous prime is 12375511. The next prime is 12375557. The reversal of 12375521 is 12557321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7623121 + 4752400 = 2761^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 12375521 - 2⁶ = 12375457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12375511) 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, 21740 + ... + 22301.

It is an arithmetic number, because the mean of its divisors is an integer number (3104961).

Almost surely, 2^12375521 is an apocalyptic number.

It is an amenable number.

12375521 is a deficient number, since it is larger than the sum of its proper divisors (44323).

12375521 is an equidigital number, since it uses as much as digits as its factorization.

12375521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44322.

The product of its digits is 2100, while the sum is 26.

The square root of 12375521 is about 3517.8858708037. The cubic root of 12375521 is about 231.3064964471.

The spelling of 12375521 in words is "twelve million, three hundred seventy-five thousand, five hundred twenty-one".