135206143 has 4 divisors (see below), whose sum is σ = 136518928. Its totient is φ = 133893360.

The previous prime is 135206129. The next prime is 135206171. The reversal of 135206143 is 341602531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341602531 = 197 ⋅1734023.

It is a cyclic number.

It is not a de Polignac number, because 135206143 - 2¹⁷ = 135075071 is a prime.

It is a super-2 number, since 2×135206143² = 36561402209872898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135206173) 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, 656238 + ... + 656443.

It is an arithmetic number, because the mean of its divisors is an integer number (34129732).

Almost surely, 2^135206143 is an apocalyptic number.

135206143 is a deficient number, since it is larger than the sum of its proper divisors (1312785).

135206143 is a wasteful number, since it uses less digits than its factorization.

135206143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312784.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 135206143 is about 11627.8176370289. The cubic root of 135206143 is about 513.2537620053.

Adding to 135206143 its reverse (341602531), we get a palindrome (476808674).

The spelling of 135206143 in words is "one hundred thirty-five million, two hundred six thousand, one hundred forty-three".