135619 has 4 divisors (see below), whose sum is σ = 147960. Its totient is φ = 123280.

The previous prime is 135617. The next prime is 135623. The reversal of 135619 is 916531.

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 135619 - 2¹ = 135617 is a prime.

It is a super-2 number, since 2×135619² = 36785026322, which contains 22 as substring.

It is a Duffinian number.

135619 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 135593 and 135602.

It is not an unprimeable number, because it can be changed into a prime (135613) 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 3 ways as a sum of consecutive naturals, for example, 6154 + ... + 6175.

It is an arithmetic number, because the mean of its divisors is an integer number (36990).

2¹³⁵⁶¹⁹ is an apocalyptic number.

135619 is a deficient number, since it is larger than the sum of its proper divisors (12341).

135619 is a wasteful number, since it uses less digits than its factorization.

135619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12340.

The product of its digits is 810, while the sum is 25.

The square root of 135619 is about 368.2648503455. The cubic root of 135619 is about 51.3775644337.

The spelling of 135619 in words is "one hundred thirty-five thousand, six hundred nineteen".