135515519 has 4 divisors (see below), whose sum is σ = 135582480. Its totient is φ = 135448560.

The previous prime is 135515503. The next prime is 135515531. The reversal of 135515519 is 915515531.

It is a happy number.

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 135515519 - 2⁴ = 135515503 is a prime.

It is a super-2 number, since 2×135515519² = 36728911779678722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135515599) 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, 30347 + ... + 34524.

It is an arithmetic number, because the mean of its divisors is an integer number (33895620).

Almost surely, 2^135515519 is an apocalyptic number.

135515519 is a deficient number, since it is larger than the sum of its proper divisors (66961).

135515519 is an equidigital number, since it uses as much as digits as its factorization.

135515519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66960.

The product of its digits is 16875, while the sum is 35.

The square root of 135515519 is about 11641.1133058656. The cubic root of 135515519 is about 513.6449361387.

The spelling of 135515519 in words is "one hundred thirty-five million, five hundred fifteen thousand, five hundred nineteen".