135505531 has 6 divisors (see below), whose sum is σ = 157628940. Its totient is φ = 116147556.

The previous prime is 135505529. The next prime is 135505541.

135505531 is nontrivially palindromic in base 10.

135505531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135505531 - 2¹ = 135505529 is a prime.

It is a super-2 number, since 2×135505531² = 36723497863183922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 135505531.

It is not an unprimeable number, because it can be changed into a prime (135505541) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1382661 + ... + 1382758.

It is an arithmetic number, because the mean of its divisors is an integer number (26271490).

Almost surely, 2^135505531 is an apocalyptic number.

135505531 is a deficient number, since it is larger than the sum of its proper divisors (22123409).

135505531 is an equidigital number, since it uses as much as digits as its factorization.

135505531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765433 (or 2765426 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 28.

The square root of 135505531 is about 11640.6843011912. The cubic root of 135505531 is about 513.6323166451.

The spelling of 135505531 in words is "one hundred thirty-five million, five hundred five thousand, five hundred thirty-one".