135643279 has 4 divisors (see below), whose sum is σ = 136843776. Its totient is φ = 134442784.

The previous prime is 135643273. The next prime is 135643283. The reversal of 135643279 is 972346531.

It is a happy number.

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 135643279 - 2⁵ = 135643247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135643273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600079 + ... + 600304.

It is an arithmetic number, because the mean of its divisors is an integer number (34210944).

Almost surely, 2^135643279 is an apocalyptic number.

135643279 is a deficient number, since it is larger than the sum of its proper divisors (1200497).

135643279 is a wasteful number, since it uses less digits than its factorization.

135643279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200496.

The product of its digits is 136080, while the sum is 40.

The square root of 135643279 is about 11646.5994607868. The cubic root of 135643279 is about 513.8063018277.

The spelling of 135643279 in words is "one hundred thirty-five million, six hundred forty-three thousand, two hundred seventy-nine".