169135639 has 4 divisors (see below), whose sum is σ = 169172424. Its totient is φ = 169098856.

The previous prime is 169135613. The next prime is 169135651. The reversal of 169135639 is 936531961.

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 169135639 - 2²³ = 160747031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 169135595 and 169135604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169139639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10312 + ... + 21085.

It is an arithmetic number, because the mean of its divisors is an integer number (42293106).

Almost surely, 2^169135639 is an apocalyptic number.

169135639 is a deficient number, since it is larger than the sum of its proper divisors (36785).

169135639 is an equidigital number, since it uses as much as digits as its factorization.

169135639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36784.

The product of its digits is 131220, while the sum is 43.

The square root of 169135639 is about 13005.2158382704. The cubic root of 169135639 is about 553.0253545334.

The spelling of 169135639 in words is "one hundred sixty-nine million, one hundred thirty-five thousand, six hundred thirty-nine".