12015881 has 4 divisors (see below), whose sum is σ = 12219600. Its totient is φ = 11812164.

The previous prime is 12015863. The next prime is 12015907. The reversal of 12015881 is 18851021.

12015881 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12015881 - 2¹⁸ = 11753737 is a prime.

It is a super-2 number, since 2×12015881² = 288762792412322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12015881.

It is not an unprimeable number, because it can be changed into a prime (12015811) 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, 101771 + ... + 101888.

It is an arithmetic number, because the mean of its divisors is an integer number (3054900).

Almost surely, 2^12015881 is an apocalyptic number.

It is an amenable number.

12015881 is a deficient number, since it is larger than the sum of its proper divisors (203719).

12015881 is an equidigital number, since it uses as much as digits as its factorization.

12015881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203718.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 12015881 is about 3466.3930821533. The cubic root of 12015881 is about 229.0437995841.

The spelling of 12015881 in words is "twelve million, fifteen thousand, eight hundred eighty-one".