135075721 has 8 divisors (see below), whose sum is σ = 149853600. Its totient is φ = 120714240.

The previous prime is 135075719. The next prime is 135075737. The reversal of 135075721 is 127570531.

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 135075721 - 2¹ = 135075719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135075751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103416 + ... + 104713.

It is an arithmetic number, because the mean of its divisors is an integer number (18731700).

Almost surely, 2^135075721 is an apocalyptic number.

135075721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

135075721 is a deficient number, since it is larger than the sum of its proper divisors (14777879).

135075721 is a wasteful number, since it uses less digits than its factorization.

135075721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208199.

The product of its (nonzero) digits is 7350, while the sum is 31.

The square root of 135075721 is about 11622.2080948501. The cubic root of 135075721 is about 513.0886779939.

The spelling of 135075721 in words is "one hundred thirty-five million, seventy-five thousand, seven hundred twenty-one".