135863309 has 4 divisors (see below), whose sum is σ = 136029216. Its totient is φ = 135697404.

The previous prime is 135863279. The next prime is 135863317. The reversal of 135863309 is 903368531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135863309 - 2²⁰ = 134814733 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 (135863389) 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, 81719 + ... + 83364.

It is an arithmetic number, because the mean of its divisors is an integer number (34007304).

Almost surely, 2^135863309 is an apocalyptic number.

It is an amenable number.

135863309 is a deficient number, since it is larger than the sum of its proper divisors (165907).

135863309 is an equidigital number, since it uses as much as digits as its factorization.

135863309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165906.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 135863309 is about 11656.0417380859. The cubic root of 135863309 is about 514.0839706464.

The spelling of 135863309 in words is "one hundred thirty-five million, eight hundred sixty-three thousand, three hundred nine".