135505421 has 4 divisors (see below), whose sum is σ = 136748700. Its totient is φ = 134262144.

The previous prime is 135505393. The next prime is 135505441. The reversal of 135505421 is 124505531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124505531 = 811 ⋅153521.

It can be written as a sum of positive squares in 2 ways, for example, as 51984100 + 83521321 = 7210^2 + 9139^2 .

It is a cyclic number.

It is not a de Polignac number, because 135505421 - 2¹⁴ = 135489037 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 (135505441) 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, 621476 + ... + 621693.

It is an arithmetic number, because the mean of its divisors is an integer number (34187175).

Almost surely, 2^135505421 is an apocalyptic number.

It is an amenable number.

135505421 is a deficient number, since it is larger than the sum of its proper divisors (1243279).

135505421 is a wasteful number, since it uses less digits than its factorization.

135505421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243278.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 135505421 is about 11640.6795763821. The cubic root of 135505421 is about 513.6321776604.

The spelling of 135505421 in words is "one hundred thirty-five million, five hundred five thousand, four hundred twenty-one".