13569687121 has 9 divisors (see below), whose sum is σ = 14323806633. Its totient is φ = 12853396260.

The previous prime is 13569687119. The next prime is 13569687199. The reversal of 13569687121 is 12178696531.

The square root of 13569687121 is 116489.

It is a perfect power (a square), and thus also a powerful number.

13569687121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13569687121 - 2¹ = 13569687119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13569687101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2210226 + ... + 2216356.

Almost surely, 2^13569687121 is an apocalyptic number.

13569687121 is the 116489-th square number.

13569687121 is the 58245-th centered octagonal number.

It is an amenable number.

13569687121 is a deficient number, since it is larger than the sum of its proper divisors (754119512).

13569687121 is an frugal number, since it uses more digits than its factorization.

13569687121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12300 (or 6150 counting only the distinct ones).

The product of its digits is 544320, while the sum is 49.

Multiplying 13569687121 by its sum of digits (49), we get a square (664914668929 = 815423²).

The spelling of 13569687121 in words is "thirteen billion, five hundred sixty-nine million, six hundred eighty-seven thousand, one hundred twenty-one".