13181613 has 16 divisors (see below), whose sum is σ = 18760896. Its totient is φ = 8203520.

The previous prime is 13181587. The next prime is 13181617. The reversal of 13181613 is 31618131.

It is not a de Polignac number, because 13181613 - 2⁶ = 13181549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13181617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5695 + ... + 7667.

It is an arithmetic number, because the mean of its divisors is an integer number (1172556).

Almost surely, 2^13181613 is an apocalyptic number.

It is an amenable number.

13181613 is a deficient number, since it is larger than the sum of its proper divisors (5579283).

13181613 is a wasteful number, since it uses less digits than its factorization.

13181613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its digits is 432, while the sum is 24.

The square root of 13181613 is about 3630.6491155164. The cubic root of 13181613 is about 236.2233653241.

Adding to 13181613 its reverse (31618131), we get a palindrome (44799744).

The spelling of 13181613 in words is "thirteen million, one hundred eighty-one thousand, six hundred thirteen".