135165621 has 8 divisors (see below), whose sum is σ = 180450144. Its totient is φ = 89995760.

The previous prime is 135165617. The next prime is 135165659. The reversal of 135165621 is 126561531.

135165621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135165621 - 2² = 135165617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135165671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25875 + ... + 30656.

It is an arithmetic number, because the mean of its divisors is an integer number (22556268).

Almost surely, 2^135165621 is an apocalyptic number.

It is an amenable number.

135165621 is a deficient number, since it is larger than the sum of its proper divisors (45284523).

135165621 is an equidigital number, since it uses as much as digits as its factorization.

135165621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57331.

The product of its digits is 5400, while the sum is 30.

The square root of 135165621 is about 11626.0750470655. The cubic root of 135165621 is about 513.2024819214.

The spelling of 135165621 in words is "one hundred thirty-five million, one hundred sixty-five thousand, six hundred twenty-one".