12193681 has 4 divisors (see below), whose sum is σ = 12214000. Its totient is φ = 12173364.

The previous prime is 12193669. The next prime is 12193691. The reversal of 12193681 is 18639121.

12193681 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 12193681 - 2⁹ = 12193169 is a prime.

It is a super-2 number, since 2×12193681² = 297371712659522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12193661) 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, 9231 + ... + 10468.

It is an arithmetic number, because the mean of its divisors is an integer number (3053500).

Almost surely, 2^12193681 is an apocalyptic number.

12193681 is the 2209-th centered pentagonal number.

It is an amenable number.

12193681 is a deficient number, since it is larger than the sum of its proper divisors (20319).

12193681 is an equidigital number, since it uses as much as digits as its factorization.

12193681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20318.

The product of its digits is 2592, while the sum is 31.

The square root of 12193681 is about 3491.9451599359. The cubic root of 12193681 is about 230.1679995010.

It can be divided in two parts, 1219 and 3681, that added together give a square (4900 = 70²).

The spelling of 12193681 in words is "twelve million, one hundred ninety-three thousand, six hundred eighty-one".