135575021 has 2 divisors, whose sum is σ = 135575022. Its totient is φ = 135575020.

The previous prime is 135575009. The next prime is 135575039. The reversal of 135575021 is 120575531.

It is a happy number.

135575021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106296100 + 29278921 = 10310^2 + 5411^2 .

It is an emirp because it is prime and its reverse (120575531) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-135575021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135575081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67787510 + 67787511.

It is an arithmetic number, because the mean of its divisors is an integer number (67787511).

Almost surely, 2^135575021 is an apocalyptic number.

It is an amenable number.

135575021 is a deficient number, since it is larger than the sum of its proper divisors (1).

135575021 is an equidigital number, since it uses as much as digits as its factorization.

135575021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5250, while the sum is 29.

The square root of 135575021 is about 11643.6687087876. The cubic root of 135575021 is about 513.7201020167.

The spelling of 135575021 in words is "one hundred thirty-five million, five hundred seventy-five thousand, twenty-one".