135752321 has 4 divisors (see below), whose sum is σ = 142897200. Its totient is φ = 128607444.

The previous prime is 135752303. The next prime is 135752329. The reversal of 135752321 is 123257531.

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 a de Polignac number, because none of the positive numbers 2^k-135752321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135752329) 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, 3572411 + ... + 3572448.

It is an arithmetic number, because the mean of its divisors is an integer number (35724300).

Almost surely, 2^135752321 is an apocalyptic number.

It is an amenable number.

135752321 is a deficient number, since it is larger than the sum of its proper divisors (7144879).

135752321 is an equidigital number, since it uses as much as digits as its factorization.

135752321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7144878.

The product of its digits is 6300, while the sum is 29.

The square root of 135752321 is about 11651.2798009489. The cubic root of 135752321 is about 513.9439458522.

The spelling of 135752321 in words is "one hundred thirty-five million, seven hundred fifty-two thousand, three hundred twenty-one".