135169531 has 16 divisors (see below), whose sum is σ = 157651200. Its totient is φ = 113495328.

The previous prime is 135169513. The next prime is 135169549. The reversal of 135169531 is 135961531.

It is a happy number.

135169531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (135169513) and next prime (135169549).

It is a cyclic number.

It is not a de Polignac number, because 135169531 - 2²⁵ = 101615099 is a prime.

It is a super-2 number, since 2×135169531² = 36541604221519922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135169031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209896 + ... + 210538.

It is an arithmetic number, because the mean of its divisors is an integer number (9853200).

Almost surely, 2^135169531 is an apocalyptic number.

135169531 is a deficient number, since it is larger than the sum of its proper divisors (22481669).

135169531 is an equidigital number, since it uses as much as digits as its factorization.

135169531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its digits is 12150, while the sum is 34.

The square root of 135169531 is about 11626.2432023418. The cubic root of 135169531 is about 513.2074304242.

The spelling of 135169531 in words is "one hundred thirty-five million, one hundred sixty-nine thousand, five hundred thirty-one".