135748169 has 4 divisors (see below), whose sum is σ = 136437444. Its totient is φ = 135058896.

The previous prime is 135748061. The next prime is 135748181. The reversal of 135748169 is 961847531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 961847531 = 12721 ⋅75611.

It can be written as a sum of positive squares in 2 ways, for example, as 124099600 + 11648569 = 11140^2 + 3413^2 .

It is a cyclic number.

It is not a de Polignac number, because 135748169 - 2²⁴ = 118970953 is a prime.

It is a super-2 number, since 2×135748169² = 36855130773705122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135748189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344342 + ... + 344735.

It is an arithmetic number, because the mean of its divisors is an integer number (34109361).

Almost surely, 2^135748169 is an apocalyptic number.

It is an amenable number.

135748169 is a deficient number, since it is larger than the sum of its proper divisors (689275).

135748169 is an equidigital number, since it uses as much as digits as its factorization.

135748169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689274.

The product of its digits is 181440, while the sum is 44.

The square root of 135748169 is about 11651.1016217352. The cubic root of 135748169 is about 513.9387061210.

The spelling of 135748169 in words is "one hundred thirty-five million, seven hundred forty-eight thousand, one hundred sixty-nine".