13112381 has 4 divisors (see below), whose sum is σ = 13120764. Its totient is φ = 13104000.

The previous prime is 13112371. The next prime is 13112383. The reversal of 13112381 is 18321131.

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 6528025 + 6584356 = 2555^2 + 2566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13112381 is a prime.

It is a super-2 number, since 2×13112381² = 343869070978322, 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 (13112383) 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, 1070 + ... + 5231.

It is an arithmetic number, because the mean of its divisors is an integer number (3280191).

Almost surely, 2^13112381 is an apocalyptic number.

It is an amenable number.

13112381 is a deficient number, since it is larger than the sum of its proper divisors (8383).

13112381 is an equidigital number, since it uses as much as digits as its factorization.

13112381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8382.

The product of its digits is 144, while the sum is 20.

The square root of 13112381 is about 3621.1021802761. The cubic root of 13112381 is about 235.8090778480.

The spelling of 13112381 in words is "thirteen million, one hundred twelve thousand, three hundred eighty-one".