13112805 has 16 divisors (see below), whose sum is σ = 21061440. Its totient is φ = 6966528.

The previous prime is 13112773. The next prime is 13112819. The reversal of 13112805 is 50821131.

13112805 = 845² + 846² + ... + 862².

It is not a de Polignac number, because 13112805 - 2⁵ = 13112773 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 2701 + ... + 5789.

It is an arithmetic number, because the mean of its divisors is an integer number (1316340).

Almost surely, 2^13112805 is an apocalyptic number.

13112805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13112805 is a deficient number, since it is larger than the sum of its proper divisors (7948635).

13112805 is a wasteful number, since it uses less digits than its factorization.

13112805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3380.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 13112805 is about 3621.1607255133. The cubic root of 13112805 is about 235.8116195163.

Adding to 13112805 its reverse (50821131), we get a palindrome (63933936).

The spelling of 13112805 in words is "thirteen million, one hundred twelve thousand, eight hundred five".