13506557 has 2 divisors, whose sum is σ = 13506558. Its totient is φ = 13506556.

The previous prime is 13506541. The next prime is 13506583. The reversal of 13506557 is 75560531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13498276 + 8281 = 3674^2 + 91^2 .

It is an emirp because it is prime and its reverse (75560531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13506557 - 2⁴ = 13506541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13506527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6753278 + 6753279.

It is an arithmetic number, because the mean of its divisors is an integer number (6753279).

Almost surely, 2^13506557 is an apocalyptic number.

It is an amenable number.

13506557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13506557 is an equidigital number, since it uses as much as digits as its factorization.

13506557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 32.

The square root of 13506557 is about 3675.1268005336. The cubic root of 13506557 is about 238.1487018841.

The spelling of 13506557 in words is "thirteen million, five hundred six thousand, five hundred fifty-seven".