12549121 has 4 divisors (see below), whose sum is σ = 13514452. Its totient is φ = 11583792.

The previous prime is 12549113. The next prime is 12549127. The reversal of 12549121 is 12194521.

It is a happy number.

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 7096896 + 5452225 = 2664^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 12549121 - 2³ = 12549113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12549127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482646 + ... + 482671.

It is an arithmetic number, because the mean of its divisors is an integer number (3378613).

Almost surely, 2^12549121 is an apocalyptic number.

It is an amenable number.

12549121 is a deficient number, since it is larger than the sum of its proper divisors (965331).

12549121 is an equidigital number, since it uses as much as digits as its factorization.

12549121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965330.

The product of its digits is 720, while the sum is 25.

The square root of 12549121 is about 3542.4738531145. The cubic root of 12549121 is about 232.3830436545.

The spelling of 12549121 in words is "twelve million, five hundred forty-nine thousand, one hundred twenty-one".