135842621 has 4 divisors (see below), whose sum is σ = 135907644. Its totient is φ = 135777600.

The previous prime is 135842617. The next prime is 135842687. The reversal of 135842621 is 126248531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126248531 = 307 ⋅411233.

It can be written as a sum of positive squares in 2 ways, for example, as 114811225 + 21031396 = 10715^2 + 4586^2 .

It is a cyclic number.

It is not a de Polignac number, because 135842621 - 2² = 135842617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135842321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29270 + ... + 33591.

It is an arithmetic number, because the mean of its divisors is an integer number (33976911).

Almost surely, 2^135842621 is an apocalyptic number.

It is an amenable number.

135842621 is a deficient number, since it is larger than the sum of its proper divisors (65023).

135842621 is an equidigital number, since it uses as much as digits as its factorization.

135842621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65022.

The product of its digits is 11520, while the sum is 32.

The square root of 135842621 is about 11655.1542675333. The cubic root of 135842621 is about 514.0578760146.

The spelling of 135842621 in words is "one hundred thirty-five million, eight hundred forty-two thousand, six hundred twenty-one".