135739321 has 4 divisors (see below), whose sum is σ = 136489444. Its totient is φ = 134989200.

The previous prime is 135739319. The next prime is 135739327. The reversal of 135739321 is 123937531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46172025 + 89567296 = 6795^2 + 9464^2 .

It is a cyclic number.

It is not a de Polignac number, because 135739321 - 2¹ = 135739319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135739327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374790 + ... + 375151.

It is an arithmetic number, because the mean of its divisors is an integer number (34122361).

Almost surely, 2^135739321 is an apocalyptic number.

It is an amenable number.

135739321 is a deficient number, since it is larger than the sum of its proper divisors (750123).

135739321 is an equidigital number, since it uses as much as digits as its factorization.

135739321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750122.

The product of its digits is 17010, while the sum is 34.

The square root of 135739321 is about 11650.7219089634. The cubic root of 135739321 is about 513.9275397863.

The spelling of 135739321 in words is "one hundred thirty-five million, seven hundred thirty-nine thousand, three hundred twenty-one".