13261505 has 4 divisors (see below), whose sum is σ = 15913812. Its totient is φ = 10609200.

The previous prime is 13261499. The next prime is 13261529. The reversal of 13261505 is 50516231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5013121 + 8248384 = 2239^2 + 2872^2 .

It is not a de Polignac number, because 13261505 - 2⁶ = 13261441 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 1326146 + ... + 1326155.

It is an arithmetic number, because the mean of its divisors is an integer number (3978453).

Almost surely, 2^13261505 is an apocalyptic number.

It is an amenable number.

13261505 is a deficient number, since it is larger than the sum of its proper divisors (2652307).

13261505 is an equidigital number, since it uses as much as digits as its factorization.

13261505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652306.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 13261505 is about 3641.6349350258. The cubic root of 13261505 is about 236.6996438431.

Adding to 13261505 its reverse (50516231), we get a palindrome (63777736).

The spelling of 13261505 in words is "thirteen million, two hundred sixty-one thousand, five hundred five".