12457121 has 4 divisors (see below), whose sum is σ = 12503700. Its totient is φ = 12410544.

The previous prime is 12457111. The next prime is 12457127. The reversal of 12457121 is 12175421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12175421 = 1291 ⋅9431.

It can be written as a sum of positive squares in 2 ways, for example, as 5107600 + 7349521 = 2260^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 12457121 - 2¹⁰ = 12456097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12457127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22886 + ... + 23423.

It is an arithmetic number, because the mean of its divisors is an integer number (3125925).

Almost surely, 2^12457121 is an apocalyptic number.

It is an amenable number.

12457121 is a deficient number, since it is larger than the sum of its proper divisors (46579).

12457121 is an equidigital number, since it uses as much as digits as its factorization.

12457121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46578.

The product of its digits is 560, while the sum is 23.

The square root of 12457121 is about 3529.4646902894. The cubic root of 12457121 is about 231.8137687508.

The spelling of 12457121 in words is "twelve million, four hundred fifty-seven thousand, one hundred twenty-one".