135681803 has 4 divisors (see below), whose sum is σ = 136161528. Its totient is φ = 135202080.

The previous prime is 135681737. The next prime is 135681827. The reversal of 135681803 is 308186531.

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 135681803 - 2²⁰ = 134633227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135681863) 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, 239438 + ... + 240003.

It is an arithmetic number, because the mean of its divisors is an integer number (34040382).

Almost surely, 2^135681803 is an apocalyptic number.

135681803 is a deficient number, since it is larger than the sum of its proper divisors (479725).

135681803 is an equidigital number, since it uses as much as digits as its factorization.

135681803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479724.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 135681803 is about 11648.2532166845. The cubic root of 135681803 is about 513.8549392059.

The spelling of 135681803 in words is "one hundred thirty-five million, six hundred eighty-one thousand, eight hundred three".