13538557 has 2 divisors, whose sum is σ = 13538558. Its totient is φ = 13538556.

The previous prime is 13538549. The next prime is 13538573. The reversal of 13538557 is 75583531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12809241 + 729316 = 3579^2 + 854^2 .

It is an emirp because it is prime and its reverse (75583531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13538557 - 2³ = 13538549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13538527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6769278 + 6769279.

It is an arithmetic number, because the mean of its divisors is an integer number (6769279).

Almost surely, 2^13538557 is an apocalyptic number.

It is an amenable number.

13538557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13538557 is an equidigital number, since it uses as much as digits as its factorization.

13538557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 37.

The square root of 13538557 is about 3679.4778162125. The cubic root of 13538557 is about 238.3366290751.

The spelling of 13538557 in words is "thirteen million, five hundred thirty-eight thousand, five hundred fifty-seven".