12558121 has 4 divisors (see below), whose sum is σ = 13296852. Its totient is φ = 11819392.

The previous prime is 12558109. The next prime is 12558127. The reversal of 12558121 is 12185521.

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 8637721 + 3920400 = 2939^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 12558121 - 2⁵ = 12558089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12558127) 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, 369340 + ... + 369373.

It is an arithmetic number, because the mean of its divisors is an integer number (3324213).

Almost surely, 2^12558121 is an apocalyptic number.

It is an amenable number.

12558121 is a deficient number, since it is larger than the sum of its proper divisors (738731).

12558121 is an equidigital number, since it uses as much as digits as its factorization.

12558121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738730.

The product of its digits is 800, while the sum is 25.

The square root of 12558121 is about 3543.7439241570. The cubic root of 12558121 is about 232.4385840016.

The spelling of 12558121 in words is "twelve million, five hundred fifty-eight thousand, one hundred twenty-one".