135216025 has 12 divisors (see below), whose sum is σ = 191620672. Its totient is φ = 92719440.

The previous prime is 135216013. The next prime is 135216041. The reversal of 135216025 is 520612531.

135216025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-135216025 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 386157 + ... + 386506.

Almost surely, 2^135216025 is an apocalyptic number.

It is an amenable number.

135216025 is a deficient number, since it is larger than the sum of its proper divisors (56404647).

135216025 is an equidigital number, since it uses as much as digits as its factorization.

135216025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772680 (or 772675 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 135216025 is about 11628.2425585296. The cubic root of 135216025 is about 513.2662659986.

Adding to 135216025 its reverse (520612531), we get a palindrome (655828556).

The spelling of 135216025 in words is "one hundred thirty-five million, two hundred sixteen thousand, twenty-five".