12135381 has 4 divisors (see below), whose sum is σ = 16180512. Its totient is φ = 8090252.

The previous prime is 12135367. The next prime is 12135413. The reversal of 12135381 is 18353121.

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 12135381 - 2⁵ = 12135349 is a prime.

It is a super-2 number, since 2×12135381² = 294534944030322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12139381) 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, 2022561 + ... + 2022566.

It is an arithmetic number, because the mean of its divisors is an integer number (4045128).

Almost surely, 2^12135381 is an apocalyptic number.

It is an amenable number.

12135381 is a deficient number, since it is larger than the sum of its proper divisors (4045131).

12135381 is an equidigital number, since it uses as much as digits as its factorization.

12135381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4045130.

The product of its digits is 720, while the sum is 24.

The square root of 12135381 is about 3483.5873751063. The cubic root of 12135381 is about 229.8005896057.

The spelling of 12135381 in words is "twelve million, one hundred thirty-five thousand, three hundred eighty-one".