13009811 has 4 divisors (see below), whose sum is σ = 13775112. Its totient is φ = 12244512.

The previous prime is 13009807. The next prime is 13009817. The reversal of 13009811 is 11890031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13009811 - 2² = 13009807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13009817) 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 3 ways as a sum of consecutive naturals, for example, 382625 + ... + 382658.

It is an arithmetic number, because the mean of its divisors is an integer number (3443778).

Almost surely, 2^13009811 is an apocalyptic number.

13009811 is a deficient number, since it is larger than the sum of its proper divisors (765301).

13009811 is an equidigital number, since it uses as much as digits as its factorization.

13009811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765300.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 13009811 is about 3606.9115597697. The cubic root of 13009811 is about 235.1926050381.

Adding to 13009811 its reverse (11890031), we get a palindrome (24899842).

It can be divided in two parts, 1300 and 9811, that added together give a palindrome (11111).

The spelling of 13009811 in words is "thirteen million, nine thousand, eight hundred eleven".