13261520251 has 16 divisors (see below), whose sum is σ = 15821296128. Its totient is φ = 10868457600.

The previous prime is 13261520219. The next prime is 13261520263. The reversal of 13261520251 is 15202516231.

It is not a de Polignac number, because 13261520251 - 2⁵ = 13261520219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13261520291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424611 + ... + 454771.

It is an arithmetic number, because the mean of its divisors is an integer number (988831008).

Almost surely, 2^13261520251 is an apocalyptic number.

13261520251 is a deficient number, since it is larger than the sum of its proper divisors (2559775877).

13261520251 is a wasteful number, since it uses less digits than its factorization.

13261520251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32922.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 13261520251 in words is "thirteen billion, two hundred sixty-one million, five hundred twenty thousand, two hundred fifty-one".