12331381 has 4 divisors (see below), whose sum is σ = 12867552. Its totient is φ = 11795212.

The previous prime is 12331369. The next prime is 12331387. The reversal of 12331381 is 18313321.

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 12331381 - 2⁹ = 12330869 is a prime.

It is a super-2 number, since 2×12331381² = 304125914734322, 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 (12331387) 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, 268051 + ... + 268096.

It is an arithmetic number, because the mean of its divisors is an integer number (3216888).

Almost surely, 2^12331381 is an apocalyptic number.

It is an amenable number.

12331381 is a deficient number, since it is larger than the sum of its proper divisors (536171).

12331381 is an equidigital number, since it uses as much as digits as its factorization.

12331381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536170.

The product of its digits is 432, while the sum is 22.

The square root of 12331381 is about 3511.6066123642. The cubic root of 12331381 is about 231.0311671245.

The spelling of 12331381 in words is "twelve million, three hundred thirty-one thousand, three hundred eighty-one".