12181613 has 2 divisors, whose sum is σ = 12181614. Its totient is φ = 12181612.

The previous prime is 12181607. The next prime is 12181619. The reversal of 12181613 is 31618121.

It is a balanced prime because it is at equal distance from previous prime (12181607) and next prime (12181619).

It can be written as a sum of positive squares in only one way, i.e., 11546404 + 635209 = 3398^2 + 797^2 .

It is an emirp because it is prime and its reverse (31618121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12181613 - 2¹⁶ = 12116077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12181619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6090806 + 6090807.

It is an arithmetic number, because the mean of its divisors is an integer number (6090807).

Almost surely, 2^12181613 is an apocalyptic number.

It is an amenable number.

12181613 is a deficient number, since it is larger than the sum of its proper divisors (1).

12181613 is an equidigital number, since it uses as much as digits as its factorization.

12181613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 23.

The square root of 12181613 is about 3490.2167554466. The cubic root of 12181613 is about 230.0920425561.

Adding to 12181613 its reverse (31618121), we get a palindrome (43799734).

The spelling of 12181613 in words is "twelve million, one hundred eighty-one thousand, six hundred thirteen".