12788161 has 4 divisors (see below), whose sum is σ = 13344192. Its totient is φ = 12232132.

The previous prime is 12788129. The next prime is 12788177. The reversal of 12788161 is 16188721.

12788161 = T₁₀₄₃ + T₁₀₄₄ + ... + T₁₀₆₅.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16188721 = 37 ⋅437533.

It is a cyclic number.

It is not a de Polignac number, because 12788161 - 2⁵ = 12788129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12788261) 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, 277981 + ... + 278026.

It is an arithmetic number, because the mean of its divisors is an integer number (3336048).

Almost surely, 2^12788161 is an apocalyptic number.

It is an amenable number.

12788161 is a deficient number, since it is larger than the sum of its proper divisors (556031).

12788161 is an equidigital number, since it uses as much as digits as its factorization.

12788161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556030.

The product of its digits is 5376, while the sum is 34.

The square root of 12788161 is about 3576.0538306910. The cubic root of 12788161 is about 233.8492771314.

It can be divided in two parts, 127 and 88161, that added together give a palindrome (88288).

The spelling of 12788161 in words is "twelve million, seven hundred eighty-eight thousand, one hundred sixty-one".