12551281 has 4 divisors (see below), whose sum is σ = 12558564. Its totient is φ = 12544000.

The previous prime is 12551269. The next prime is 12551291. The reversal of 12551281 is 18215521.

12551281 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18215521 = 41 ⋅444281.

It can be written as a sum of positive squares in 2 ways, for example, as 8208225 + 4343056 = 2865^2 + 2084^2 .

It is a 3-Lehmer number, since φ(12551281) divides (12551281-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12551281 is a prime.

It is a super-2 number, since 2×12551281² = 315069309481922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12551291) 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, 561 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (3139641).

Almost surely, 2^12551281 is an apocalyptic number.

It is an amenable number.

12551281 is a deficient number, since it is larger than the sum of its proper divisors (7283).

12551281 is an equidigital number, since it uses as much as digits as its factorization.

12551281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7282.

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

The square root of 12551281 is about 3542.7787116895. The cubic root of 12551281 is about 232.3963757590.

The spelling of 12551281 in words is "twelve million, five hundred fifty-one thousand, two hundred eighty-one".