135566549 has 2 divisors, whose sum is σ = 135566550. Its totient is φ = 135566548.

The previous prime is 135566507. The next prime is 135566567. The reversal of 135566549 is 945665531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88548100 + 47018449 = 9410^2 + 6857^2 .

It is an emirp because it is prime and its reverse (945665531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135566549 - 2¹⁶ = 135501013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135566149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67783274 + 67783275.

It is an arithmetic number, because the mean of its divisors is an integer number (67783275).

Almost surely, 2^135566549 is an apocalyptic number.

It is an amenable number.

135566549 is a deficient number, since it is larger than the sum of its proper divisors (1).

135566549 is an equidigital number, since it uses as much as digits as its factorization.

135566549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 44.

The square root of 135566549 is about 11643.3049002420. The cubic root of 135566549 is about 513.7094011090.

The spelling of 135566549 in words is "one hundred thirty-five million, five hundred sixty-six thousand, five hundred forty-nine".