12113131 has 4 divisors (see below), whose sum is σ = 12293992. Its totient is φ = 11932272.

The previous prime is 12113119. The next prime is 12113147. The reversal of 12113131 is 13131121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12113131 - 2²¹ = 10015979 is a prime.

It is a super-2 number, since 2×12113131² = 293455885246322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (12113191) 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, 90330 + ... + 90463.

It is an arithmetic number, because the mean of its divisors is an integer number (3073498).

Almost surely, 2^12113131 is an apocalyptic number.

12113131 is a deficient number, since it is larger than the sum of its proper divisors (180861).

12113131 is an equidigital number, since it uses as much as digits as its factorization.

12113131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180860.

The product of its digits is 18, while the sum is 13.

The square root of 12113131 is about 3480.3923629384. The cubic root of 12113131 is about 229.6600586187.

Adding to 12113131 its reverse (13131121), we get a palindrome (25244252).

It can be divided in two parts, 121 and 13131, that multiplied together give a palindrome (1588851).

The spelling of 12113131 in words is "twelve million, one hundred thirteen thousand, one hundred thirty-one".