135545721 has 8 divisors (see below), whose sum is σ = 183690624. Its totient is φ = 88882320.

The previous prime is 135545701. The next prime is 135545731. The reversal of 135545721 is 127545531.

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

It is not a de Polignac number, because 135545721 - 2⁹ = 135545209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135545701) 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, 370161 + ... + 370526.

It is an arithmetic number, because the mean of its divisors is an integer number (22961328).

Almost surely, 2^135545721 is an apocalyptic number.

It is an amenable number.

135545721 is a deficient number, since it is larger than the sum of its proper divisors (48144903).

135545721 is an equidigital number, since it uses as much as digits as its factorization.

135545721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740751.

The product of its digits is 21000, while the sum is 33.

The square root of 135545721 is about 11642.4104462950. The cubic root of 135545721 is about 513.6830915523.

The spelling of 135545721 in words is "one hundred thirty-five million, five hundred forty-five thousand, seven hundred twenty-one".