135081571 has 4 divisors (see below), whose sum is σ = 135676872. Its totient is φ = 134486272.

The previous prime is 135081563. The next prime is 135081607. The reversal of 135081571 is 175180531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135081571 - 2³ = 135081563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135081671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 297310 + ... + 297763.

It is an arithmetic number, because the mean of its divisors is an integer number (33919218).

Almost surely, 2^135081571 is an apocalyptic number.

135081571 is a deficient number, since it is larger than the sum of its proper divisors (595301).

135081571 is an equidigital number, since it uses as much as digits as its factorization.

135081571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595300.

The product of its (nonzero) digits is 4200, while the sum is 31.

The square root of 135081571 is about 11622.4597654713. The cubic root of 135081571 is about 513.0960850133.

The spelling of 135081571 in words is "one hundred thirty-five million, eighty-one thousand, five hundred seventy-one".