135842321 has 2 divisors, whose sum is σ = 135842322. Its totient is φ = 135842320.

The previous prime is 135842263. The next prime is 135842327. The reversal of 135842321 is 123248531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105987025 + 29855296 = 10295^2 + 5464^2 .

It is a cyclic number.

It is not a de Polignac number, because 135842321 - 2¹⁰ = 135841297 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (135842327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67921160 + 67921161.

It is an arithmetic number, because the mean of its divisors is an integer number (67921161).

Almost surely, 2^135842321 is an apocalyptic number.

It is an amenable number.

135842321 is a deficient number, since it is larger than the sum of its proper divisors (1).

135842321 is an equidigital number, since it uses as much as digits as its factorization.

135842321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 135842321 is about 11655.1413976837. The cubic root of 135842321 is about 514.0574975927.

The spelling of 135842321 in words is "one hundred thirty-five million, eight hundred forty-two thousand, three hundred twenty-one".