135216019 has 4 divisors (see below), whose sum is σ = 138870544. Its totient is φ = 131561496.

The previous prime is 135216013. The next prime is 135216041. The reversal of 135216019 is 910612531.

135216019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 135216019 - 2⁵ = 135215987 is a prime.

It is a super-2 number, since 2×135216019² = 36566743588416722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135216013) 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, 1827207 + ... + 1827280.

It is an arithmetic number, because the mean of its divisors is an integer number (34717636).

Almost surely, 2^135216019 is an apocalyptic number.

135216019 is a deficient number, since it is larger than the sum of its proper divisors (3654525).

135216019 is an equidigital number, since it uses as much as digits as its factorization.

135216019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654524.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 135216019 is about 11628.2423005371. The cubic root of 135216019 is about 513.2662584068.

It can be divided in two parts, 1352 and 16019, that added together give a palindrome (17371).

The spelling of 135216019 in words is "one hundred thirty-five million, two hundred sixteen thousand, nineteen".