135520571 has 2 divisors, whose sum is σ = 135520572. Its totient is φ = 135520570.

The previous prime is 135520519. The next prime is 135520579. The reversal of 135520571 is 175025531.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135520571 - 2⁶ = 135520507 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (135520579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67760285 + 67760286.

It is an arithmetic number, because the mean of its divisors is an integer number (67760286).

Almost surely, 2^135520571 is an apocalyptic number.

135520571 is a deficient number, since it is larger than the sum of its proper divisors (1).

135520571 is an equidigital number, since it uses as much as digits as its factorization.

135520571 is an odious number, because the sum of its binary digits is odd.

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

The square root of 135520571 is about 11641.3302933986. The cubic root of 135520571 is about 513.6513189303.

The spelling of 135520571 in words is "one hundred thirty-five million, five hundred twenty thousand, five hundred seventy-one".