12381013 has 4 divisors (see below), whose sum is σ = 12390988. Its totient is φ = 12371040.

The previous prime is 12381011. The next prime is 12381023. The reversal of 12381013 is 31018321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9746884 + 2634129 = 3122^2 + 1623^2 .

It is a cyclic number.

It is not a de Polignac number, because 12381013 - 2¹ = 12381011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381011) 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, 2808 + ... + 5713.

It is an arithmetic number, because the mean of its divisors is an integer number (3097747).

Almost surely, 2^12381013 is an apocalyptic number.

It is an amenable number.

12381013 is a deficient number, since it is larger than the sum of its proper divisors (9975).

12381013 is an equidigital number, since it uses as much as digits as its factorization.

12381013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9974.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 12381013 is about 3518.6663666793. Note that the first 3 decimals coincide. The cubic root of 12381013 is about 231.3407077316.

Adding to 12381013 its reverse (31018321), we get a palindrome (43399334).

The spelling of 12381013 in words is "twelve million, three hundred eighty-one thousand, thirteen".