13511521 has 2 divisors, whose sum is σ = 13511522. Its totient is φ = 13511520.

The previous prime is 13511483. The next prime is 13511539. The reversal of 13511521 is 12511531.

13511521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9859600 + 3651921 = 3140^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 13511521 - 2¹¹ = 13509473 is a prime.

It is a super-2 number, since 2×13511521² = 365122399466882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13511551) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6755760 + 6755761.

It is an arithmetic number, because the mean of its divisors is an integer number (6755761).

Almost surely, 2^13511521 is an apocalyptic number.

It is an amenable number.

13511521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13511521 is an equidigital number, since it uses as much as digits as its factorization.

13511521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 19.

The square root of 13511521 is about 3675.8020893405. The cubic root of 13511521 is about 238.1778735267.

The spelling of 13511521 in words is "thirteen million, five hundred eleven thousand, five hundred twenty-one".