12147881 has 4 divisors (see below), whose sum is σ = 12163200. Its totient is φ = 12132564.

The previous prime is 12147871. The next prime is 12147899. The reversal of 12147881 is 18874121.

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: 18874121 = 7 ⋅2696303.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12147881 is a prime.

It is a super-2 number, since 2×12147881² = 295142025580322, 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 (12147871) 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, 6401 + ... + 8078.

It is an arithmetic number, because the mean of its divisors is an integer number (3040800).

Almost surely, 2^12147881 is an apocalyptic number.

It is an amenable number.

12147881 is a deficient number, since it is larger than the sum of its proper divisors (15319).

12147881 is an equidigital number, since it uses as much as digits as its factorization.

12147881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15318.

The product of its digits is 3584, while the sum is 32.

The square root of 12147881 is about 3485.3810408620. The cubic root of 12147881 is about 229.8794642523.

The spelling of 12147881 in words is "twelve million, one hundred forty-seven thousand, eight hundred eighty-one".