13520857109 has 2 divisors, whose sum is σ = 13520857110. Its totient is φ = 13520857108.

The previous prime is 13520857093. The next prime is 13520857153. The reversal of 13520857109 is 90175802531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10920877009 + 2599980100 = 104503^2 + 50990^2 .

It is an emirp because it is prime and its reverse (90175802531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13520857109 - 2⁴ = 13520857093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13520857169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760428554 + 6760428555.

It is an arithmetic number, because the mean of its divisors is an integer number (6760428555).

Almost surely, 2^13520857109 is an apocalyptic number.

It is an amenable number.

13520857109 is a deficient number, since it is larger than the sum of its proper divisors (1).

13520857109 is an equidigital number, since it uses as much as digits as its factorization.

13520857109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 41.

The spelling of 13520857109 in words is "thirteen billion, five hundred twenty million, eight hundred fifty-seven thousand, one hundred nine".