135571 has 2 divisors, whose sum is σ = 135572. Its totient is φ = 135570.

The previous prime is 135559. The next prime is 135581. The reversal of 135571 is 175531.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 135571 - 2⁹ = 135059 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (135511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67785 + 67786.

It is an arithmetic number, because the mean of its divisors is an integer number (67786).

2¹³⁵⁵⁷¹ is an apocalyptic number.

135571 is a deficient number, since it is larger than the sum of its proper divisors (1).

135571 is an equidigital number, since it uses as much as digits as its factorization.

135571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 525, while the sum is 22.

The square root of 135571 is about 368.1996740900. The cubic root of 135571 is about 51.3715023183.

The spelling of 135571 in words is "one hundred thirty-five thousand, five hundred seventy-one".