135581565 has 32 divisors (see below), whose sum is σ = 248647680. Its totient is φ = 61798464.

The previous prime is 135581557. The next prime is 135581591. The reversal of 135581565 is 565185531.

It is not a de Polignac number, because 135581565 - 2³ = 135581557 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38092 + ... + 41498.

It is an arithmetic number, because the mean of its divisors is an integer number (7770240).

Almost surely, 2^135581565 is an apocalyptic number.

135581565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135581565 is a deficient number, since it is larger than the sum of its proper divisors (113066115).

135581565 is a wasteful number, since it uses less digits than its factorization.

135581565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801.

The product of its digits is 90000, while the sum is 39.

The square root of 135581565 is about 11643.9497164837. The cubic root of 135581565 is about 513.7283673796.

The spelling of 135581565 in words is "one hundred thirty-five million, five hundred eighty-one thousand, five hundred sixty-five".