135168293 has 4 divisors (see below), whose sum is σ = 145565868. Its totient is φ = 124770720.

The previous prime is 135168283. The next prime is 135168301. The reversal of 135168293 is 392861531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 392861531 = 71 ⋅5533261.

It can be written as a sum of positive squares in 2 ways, for example, as 8988004 + 126180289 = 2998^2 + 11233^2 .

It is a cyclic number.

It is not a de Polignac number, because 135168293 - 2²² = 130973989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135168203) 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, 5198768 + ... + 5198793.

It is an arithmetic number, because the mean of its divisors is an integer number (36391467).

Almost surely, 2^135168293 is an apocalyptic number.

135168293 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

135168293 is a deficient number, since it is larger than the sum of its proper divisors (10397575).

135168293 is a wasteful number, since it uses less digits than its factorization.

135168293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10397574.

The product of its digits is 38880, while the sum is 38.

The square root of 135168293 is about 11626.1899606019. The cubic root of 135168293 is about 513.2058636196.

The spelling of 135168293 in words is "one hundred thirty-five million, one hundred sixty-eight thousand, two hundred ninety-three".