135919 has 4 divisors (see below), whose sum is σ = 155344. Its totient is φ = 116496.

The previous prime is 135913. The next prime is 135929. The reversal of 135919 is 919531.

135919 = 148² + 149² + ... + 153².

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 135919 - 2³ = 135911 is a prime.

It is a super-2 number, since 2×135919² = 36947949122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135911) 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, 9702 + ... + 9715.

It is an arithmetic number, because the mean of its divisors is an integer number (38836).

2¹³⁵⁹¹⁹ is an apocalyptic number.

135919 is a deficient number, since it is larger than the sum of its proper divisors (19425).

135919 is an equidigital number, since it uses as much as digits as its factorization.

135919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19424.

The product of its digits is 1215, while the sum is 28.

The square root of 135919 is about 368.6719408905. The cubic root of 135919 is about 51.4154202852.

It can be divided in two parts, 1359 and 19, that added together give a triangular number (1378 = T₅₂).

The spelling of 135919 in words is "one hundred thirty-five thousand, nine hundred nineteen".