13505813 has 2 divisors, whose sum is σ = 13505814. Its totient is φ = 13505812.

The previous prime is 13505809. The next prime is 13505857. The reversal of 13505813 is 31850531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13490929 + 14884 = 3673^2 + 122^2 .

It is an emirp because it is prime and its reverse (31850531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13505813 - 2² = 13505809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13505413) 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 as a sum of consecutive naturals, namely, 6752906 + 6752907.

It is an arithmetic number, because the mean of its divisors is an integer number (6752907).

Almost surely, 2^13505813 is an apocalyptic number.

It is an amenable number.

13505813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13505813 is an equidigital number, since it uses as much as digits as its factorization.

13505813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 13505813 is about 3675.0255781423. The cubic root of 13505813 is about 238.1443290478.

The spelling of 13505813 in words is "thirteen million, five hundred five thousand, eight hundred thirteen".