13575521 has 2 divisors, whose sum is σ = 13575522. Its totient is φ = 13575520.

The previous prime is 13575491. The next prime is 13575533. The reversal of 13575521 is 12557531.

It is a happy number.

13575521 is digitally balanced in base 2 and base 3, because in such bases 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., 12285025 + 1290496 = 3505^2 + 1136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13575521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13575421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6787760 + 6787761.

It is an arithmetic number, because the mean of its divisors is an integer number (6787761).

Almost surely, 2^13575521 is an apocalyptic number.

It is an amenable number.

13575521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13575521 is an equidigital number, since it uses as much as digits as its factorization.

13575521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 29.

The square root of 13575521 is about 3684.4973877043. The cubic root of 13575521 is about 238.5533402431.

The spelling of 13575521 in words is "thirteen million, five hundred seventy-five thousand, five hundred twenty-one".