13109805 has 24 divisors (see below), whose sum is σ = 24061752. Its totient is φ = 6580224.

The previous prime is 13109779. The next prime is 13109809. The reversal of 13109805 is 50890131.

It can be written as a sum of positive squares in 4 ways, for example, as 171396 + 12938409 = 414^2 + 3597^2 .

It is not a de Polignac number, because 13109805 - 2⁸ = 13109549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13109809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7804 + ... + 9333.

It is an arithmetic number, because the mean of its divisors is an integer number (1002573).

Almost surely, 2^13109805 is an apocalyptic number.

13109805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13109805 is a deficient number, since it is larger than the sum of its proper divisors (10951947).

13109805 is a wasteful number, since it uses less digits than its factorization.

13109805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17165 (or 17162 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 13109805 is about 3620.7464699976. The cubic root of 13109805 is about 235.7936348361.

Adding to 13109805 its reverse (50890131), we get a palindrome (63999936).

The spelling of 13109805 in words is "thirteen million, one hundred nine thousand, eight hundred five".