12278081 has 4 divisors (see below), whose sum is σ = 12341892. Its totient is φ = 12214272.

The previous prime is 12278039. The next prime is 12278083. The reversal of 12278081 is 18087221.

12278081 is digitally balanced in base 2, 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 an emirpimes, since its reverse is a distinct semiprime: 18087221 = 19 ⋅951959.

It can be written as a sum of positive squares in 2 ways, for example, as 4879681 + 7398400 = 2209^2 + 2720^2 .

It is a cyclic number.

It is not a de Polignac number, because 12278081 - 2⁶ = 12278017 is a prime.

It is a super-2 number, since 2×12278081² = 301502546085122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12278083) 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, 31616 + ... + 32001.

It is an arithmetic number, because the mean of its divisors is an integer number (3085473).

Almost surely, 2^12278081 is an apocalyptic number.

It is an amenable number.

12278081 is a deficient number, since it is larger than the sum of its proper divisors (63811).

12278081 is an equidigital number, since it uses as much as digits as its factorization.

12278081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63810.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 12278081 is about 3504.0092751019. The cubic root of 12278081 is about 230.6978239382.

The spelling of 12278081 in words is "twelve million, two hundred seventy-eight thousand, eighty-one".