13243505 has 16 divisors (see below), whose sum is σ = 17409600. Its totient is φ = 9591360.

The previous prime is 13243471. The next prime is 13243537. The reversal of 13243505 is 50534231.

It is a de Polignac number, because none of the positive numbers 2^k-13243505 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21086 + ... + 21704.

It is an arithmetic number, because the mean of its divisors is an integer number (1088100).

Almost surely, 2^13243505 is an apocalyptic number.

It is an amenable number.

13243505 is a deficient number, since it is larger than the sum of its proper divisors (4166095).

13243505 is a wasteful number, since it uses less digits than its factorization.

13243505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 13243505 is about 3639.1626784193. The cubic root of 13243505 is about 236.5925035978.

Adding to 13243505 its reverse (50534231), we get a palindrome (63777736).

The spelling of 13243505 in words is "thirteen million, two hundred forty-three thousand, five hundred five".