135819 has 6 divisors (see below), whose sum is σ = 196196. Its totient is φ = 90540.

The previous prime is 135799. The next prime is 135829. The reversal of 135819 is 918531.

It is not a de Polignac number, because 135819 - 2⁵ = 135787 is a prime.

It is a super-2 number, since 2×135819² = 36893601522, which contains 22 as substring.

It is a Duffinian number.

135819 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 135792 and 135801.

It is not an unprimeable number, because it can be changed into a prime (135829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7537 + ... + 7554.

2¹³⁵⁸¹⁹ is an apocalyptic number.

135819 is a deficient number, since it is larger than the sum of its proper divisors (60377).

135819 is a wasteful number, since it uses less digits than its factorization.

135819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15097 (or 15094 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 135819 is about 368.5362940064. The cubic root of 135819 is about 51.4028078629.

It can be divided in two parts, 13 and 5819, that added together give a cube (5832 = 18³).

The spelling of 135819 in words is "one hundred thirty-five thousand, eight hundred nineteen".