135561009 has 8 divisors (see below), whose sum is σ = 191380320. Its totient is φ = 85057856.

The previous prime is 135560987. The next prime is 135561017. The reversal of 135561009 is 900165531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 135561009 - 2⁷ = 135560881 is a prime.

It is a super-2 number, since 2×135561009² = 36753574322196162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135561059) 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 7 ways as a sum of consecutive naturals, for example, 1328979 + ... + 1329080.

It is an arithmetic number, because the mean of its divisors is an integer number (23922540).

Almost surely, 2^135561009 is an apocalyptic number.

It is an amenable number.

135561009 is a deficient number, since it is larger than the sum of its proper divisors (55819311).

135561009 is a wasteful number, since it uses less digits than its factorization.

135561009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2658079.

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 135561009 is about 11643.0669928503. The cubic root of 135561009 is about 513.7024033433.

The spelling of 135561009 in words is "one hundred thirty-five million, five hundred sixty-one thousand, nine".