13213505 has 8 divisors (see below), whose sum is σ = 16789032. Its totient is φ = 9948928.

The previous prime is 13213481. The next prime is 13213507. The reversal of 13213505 is 50531231.

13213505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1317904 + 11895601 = 1148^2 + 3449^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13213505 - 2⁶ = 13213441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13213507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77642 + ... + 77811.

It is an arithmetic number, because the mean of its divisors is an integer number (2098629).

Almost surely, 2^13213505 is an apocalyptic number.

It is an amenable number.

13213505 is a deficient number, since it is larger than the sum of its proper divisors (3575527).

13213505 is a wasteful number, since it uses less digits than its factorization.

13213505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155475.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 13213505 is about 3635.0385142389. The cubic root of 13213505 is about 236.4137205818.

Adding to 13213505 its reverse (50531231), we get a palindrome (63744736).

The spelling of 13213505 in words is "thirteen million, two hundred thirteen thousand, five hundred five".