135555243 has 12 divisors (see below), whose sum is σ = 181836984. Its totient is φ = 89824000.

The previous prime is 135555181. The next prime is 135555247. The reversal of 135555243 is 342555531.

It is a happy number.

It is not a de Polignac number, because 135555243 - 2¹⁰ = 135554219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135555247) 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 11 ways as a sum of consecutive naturals, for example, 337843 + ... + 338243.

It is an arithmetic number, because the mean of its divisors is an integer number (15153082).

Almost surely, 2^135555243 is an apocalyptic number.

135555243 is a deficient number, since it is larger than the sum of its proper divisors (46281741).

135555243 is an frugal number, since it uses more digits than its factorization.

135555243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086 (or 685 counting only the distinct ones).

The product of its digits is 45000, while the sum is 33.

The square root of 135555243 is about 11642.8193750483. The cubic root of 135555243 is about 513.6951199066.

The spelling of 135555243 in words is "one hundred thirty-five million, five hundred fifty-five thousand, two hundred forty-three".