135681555 has 16 divisors (see below), whose sum is σ = 222140160. Its totient is φ = 70680288.

The previous prime is 135681541. The next prime is 135681569. The reversal of 135681555 is 555186531.

It is an interprime number because it is at equal distance from previous prime (135681541) and next prime (135681569).

It is not a de Polignac number, because 135681555 - 2¹⁷ = 135550483 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 104535 + ... + 105824.

It is an arithmetic number, because the mean of its divisors is an integer number (13883760).

Almost surely, 2^135681555 is an apocalyptic number.

135681555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

135681555 is a deficient number, since it is larger than the sum of its proper divisors (86458605).

135681555 is a wasteful number, since it uses less digits than its factorization.

135681555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210410.

The product of its digits is 90000, while the sum is 39.

The square root of 135681555 is about 11648.2425713066. The cubic root of 135681555 is about 513.8546261300.

The spelling of 135681555 in words is "one hundred thirty-five million, six hundred eighty-one thousand, five hundred fifty-five".