135086721 has 16 divisors (see below), whose sum is σ = 224560128. Its totient is φ = 70174800.

The previous prime is 135086717. The next prime is 135086723. The reversal of 135086721 is 127680531.

It is not a de Polignac number, because 135086721 - 2² = 135086717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (135086723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 292165 + ... + 292626.

It is an arithmetic number, because the mean of its divisors is an integer number (14035008).

Almost surely, 2^135086721 is an apocalyptic number.

135086721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135086721 is a deficient number, since it is larger than the sum of its proper divisors (89473407).

135086721 is a wasteful number, since it uses less digits than its factorization.

135086721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584812.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 135086721 is about 11622.6813171488. The cubic root of 135086721 is about 513.1026055456.

The spelling of 135086721 in words is "one hundred thirty-five million, eighty-six thousand, seven hundred twenty-one".