12113581 has 2 divisors, whose sum is σ = 12113582. Its totient is φ = 12113580.

The previous prime is 12113579. The next prime is 12113593. The reversal of 12113581 is 18531121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6937956 + 5175625 = 2634^2 + 2275^2 .

It is a cyclic number.

It is not a de Polignac number, because 12113581 - 2¹ = 12113579 is a prime.

It is a super-2 number, since 2×12113581² = 293477689287122, which contains 22 as substring.

Together with 12113579, it forms a pair of twin primes.

It is a zygodrome in base 5.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12116581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6056790 + 6056791.

It is an arithmetic number, because the mean of its divisors is an integer number (6056791).

Almost surely, 2^12113581 is an apocalyptic number.

It is an amenable number.

12113581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12113581 is an equidigital number, since it uses as much as digits as its factorization.

12113581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 240, while the sum is 22.

The square root of 12113581 is about 3480.4570102215. The cubic root of 12113581 is about 229.6629025227.

The spelling of 12113581 in words is "twelve million, one hundred thirteen thousand, five hundred eighty-one".