135455561 has 4 divisors (see below), whose sum is σ = 136047300. Its totient is φ = 134863824.

The previous prime is 135455543. The next prime is 135455591. The reversal of 135455561 is 165554531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106090000 + 29365561 = 10300^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 135455561 - 2⁶ = 135455497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135455501) 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, 295526 + ... + 295983.

It is an arithmetic number, because the mean of its divisors is an integer number (34011825).

Almost surely, 2^135455561 is an apocalyptic number.

It is an amenable number.

135455561 is a deficient number, since it is larger than the sum of its proper divisors (591739).

135455561 is an equidigital number, since it uses as much as digits as its factorization.

135455561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591738.

The product of its digits is 45000, while the sum is 35.

The square root of 135455561 is about 11638.5377517968. The cubic root of 135455561 is about 513.5691719595.

The spelling of 135455561 in words is "one hundred thirty-five million, four hundred fifty-five thousand, five hundred sixty-one".