135230721 has 4 divisors (see below), whose sum is σ = 180307632. Its totient is φ = 90153812.

The previous prime is 135230713. The next prime is 135230749. The reversal of 135230721 is 127032531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 135230721 - 2³ = 135230713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 135230691 and 135230700.

It is not an unprimeable number, because it can be changed into a prime (135230791) 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 3 ways as a sum of consecutive naturals, for example, 22538451 + ... + 22538456.

It is an arithmetic number, because the mean of its divisors is an integer number (45076908).

Almost surely, 2^135230721 is an apocalyptic number.

It is an amenable number.

135230721 is a deficient number, since it is larger than the sum of its proper divisors (45076911).

135230721 is an equidigital number, since it uses as much as digits as its factorization.

135230721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45076910.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 135230721 is about 11628.8744511238. The cubic root of 135230721 is about 513.2848601649.

The spelling of 135230721 in words is "one hundred thirty-five million, two hundred thirty thousand, seven hundred twenty-one".