13520523517 has 2 divisors, whose sum is σ = 13520523518. Its totient is φ = 13520523516.

The previous prime is 13520523479. The next prime is 13520523559. The reversal of 13520523517 is 71532502531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13434200836 + 86322681 = 115906^2 + 9291^2 .

It is a cyclic number.

It is not a de Polignac number, because 13520523517 - 2²⁷ = 13386305789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13520523587) 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 as a sum of consecutive naturals, namely, 6760261758 + 6760261759.

It is an arithmetic number, because the mean of its divisors is an integer number (6760261759).

Almost surely, 2^13520523517 is an apocalyptic number.

It is an amenable number.

13520523517 is a deficient number, since it is larger than the sum of its proper divisors (1).

13520523517 is an equidigital number, since it uses as much as digits as its factorization.

13520523517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31500, while the sum is 34.

The spelling of 13520523517 in words is "thirteen billion, five hundred twenty million, five hundred twenty-three thousand, five hundred seventeen".