135604531 has 4 divisors (see below), whose sum is σ = 135710064. Its totient is φ = 135499000.

The previous prime is 135604451. The next prime is 135604543. The reversal of 135604531 is 135406531.

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 135604531 - 2²¹ = 133507379 is a prime.

It is a super-2 number, since 2×135604531² = 36777177655459922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 135604531.

It is not an unprimeable number, because it can be changed into a prime (135604561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50815 + ... + 53416.

It is an arithmetic number, because the mean of its divisors is an integer number (33927516).

Almost surely, 2^135604531 is an apocalyptic number.

135604531 is a deficient number, since it is larger than the sum of its proper divisors (105533).

135604531 is a wasteful number, since it uses less digits than its factorization.

135604531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105532.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 135604531 is about 11644.9358521204. The cubic root of 135604531 is about 513.7573723543.

The spelling of 135604531 in words is "one hundred thirty-five million, six hundred four thousand, five hundred thirty-one".