13261634261 has 4 divisors (see below), whose sum is σ = 14041730412. Its totient is φ = 12481538112.

The previous prime is 13261634201. The next prime is 13261634311. The reversal of 13261634261 is 16243616231.

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 11779846225 + 1481788036 = 108535^2 + 38494^2 .

It is a cyclic number.

It is not a de Polignac number, because 13261634261 - 2¹⁰ = 13261633237 is a prime.

It is a super-2 number, since 2×13261634261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13261634201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390048050 + ... + 390048083.

It is an arithmetic number, because the mean of its divisors is an integer number (3510432603).

Almost surely, 2^13261634261 is an apocalyptic number.

It is an amenable number.

13261634261 is a deficient number, since it is larger than the sum of its proper divisors (780096151).

13261634261 is an equidigital number, since it uses as much as digits as its factorization.

13261634261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780096150.

The product of its digits is 31104, while the sum is 35.

The spelling of 13261634261 in words is "thirteen billion, two hundred sixty-one million, six hundred thirty-four thousand, two hundred sixty-one".