135555975 has 72 divisors (see below), whose sum is σ = 262788240. Its totient is φ = 66562560.

The previous prime is 135555961. The next prime is 135555983. The reversal of 135555975 is 579555531.

135555975 is a `hidden beast` number, since 1 + 3 + 5 + 55 + 597 + 5 = 666.

It is not a de Polignac number, because 135555975 - 2⁶ = 135555911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 135555975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 157747 + ... + 158603.

Almost surely, 2^135555975 is an apocalyptic number.

135555975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

135555975 is a deficient number, since it is larger than the sum of its proper divisors (127232265).

135555975 is a wasteful number, since it uses less digits than its factorization.

135555975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929 (or 921 counting only the distinct ones).

The product of its digits is 590625, while the sum is 45.

The square root of 135555975 is about 11642.8508106907. The cubic root of 135555975 is about 513.6960445583.

The spelling of 135555975 in words is "one hundred thirty-five million, five hundred fifty-five thousand, nine hundred seventy-five".