13618913 has 18 divisors (see below), whose sum is σ = 17421138. Its totient is φ = 10607520.

The previous prime is 13618909. The next prime is 13618949. The reversal of 13618913 is 31981631.

It can be written as a sum of positive squares in only one way, i.e., 11478544 + 2140369 = 3388^2 + 1463^2 .

It is not a de Polignac number, because 13618913 - 2² = 13618909 is a prime.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 13618913.

It is not an unprimeable number, because it can be changed into a prime (13618903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4781 + ... + 7077.

It is an arithmetic number, because the mean of its divisors is an integer number (967841).

Almost surely, 2^13618913 is an apocalyptic number.

It is an amenable number.

13618913 is a deficient number, since it is larger than the sum of its proper divisors (3802225).

13618913 is a wasteful number, since it uses less digits than its factorization.

13618913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333 (or 2315 counting only the distinct ones).

The product of its digits is 3888, while the sum is 32.

The square root of 13618913 is about 3690.3811456271. The cubic root of 13618913 is about 238.8072358962.

The spelling of 13618913 in words is "thirteen million, six hundred eighteen thousand, nine hundred thirteen".