13557087209 has 2 divisors, whose sum is σ = 13557087210. Its totient is φ = 13557087208.

The previous prime is 13557087197. The next prime is 13557087239. The reversal of 13557087209 is 90278075531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10941787609 + 2615299600 = 104603^2 + 51140^2 .

It is a cyclic number.

It is not a de Polignac number, because 13557087209 - 2²⁰ = 13556038633 is a prime.

It is a super-2 number, since 2×13557087209² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13557087239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6778543604 + 6778543605.

It is an arithmetic number, because the mean of its divisors is an integer number (6778543605).

Almost surely, 2^13557087209 is an apocalyptic number.

It is an amenable number.

13557087209 is a deficient number, since it is larger than the sum of its proper divisors (1).

13557087209 is an equidigital number, since it uses as much as digits as its factorization.

13557087209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 13557087209 in words is "thirteen billion, five hundred fifty-seven million, eighty-seven thousand, two hundred nine".