12108781 has 4 divisors (see below), whose sum is σ = 12183232. Its totient is φ = 12034332.

The previous prime is 12108769. The next prime is 12108797. The reversal of 12108781 is 18780121.

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 12108781 - 2²¹ = 10011629 is a prime.

It is a super-2 number, since 2×12108781² = 293245154611922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12108181) 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, 36981 + ... + 37306.

It is an arithmetic number, because the mean of its divisors is an integer number (3045808).

Almost surely, 2^12108781 is an apocalyptic number.

It is an amenable number.

12108781 is a deficient number, since it is larger than the sum of its proper divisors (74451).

12108781 is an equidigital number, since it uses as much as digits as its factorization.

12108781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74450.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 12108781 is about 3479.7673772826. The cubic root of 12108781 is about 229.6325639143.

The spelling of 12108781 in words is "twelve million, one hundred eight thousand, seven hundred eighty-one".