855120561 has 8 divisors (see below), whose sum is σ = 1146130944. Its totient is φ = 567095280.

The previous prime is 855120557. The next prime is 855120583. The reversal of 855120561 is 165021558.

855120561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 855120561 - 2² = 855120557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855124561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745606 + ... + 746751.

It is an arithmetic number, because the mean of its divisors is an integer number (143266368).

Almost surely, 2^855120561 is an apocalyptic number.

It is an amenable number.

855120561 is a deficient number, since it is larger than the sum of its proper divisors (291010383).

855120561 is a wasteful number, since it uses less digits than its factorization.

855120561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492551.

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 855120561 is about 29242.4445113605. Note that the first 3 decimals coincide. The cubic root of 855120561 is about 949.1666046602.

The spelling of 855120561 in words is "eight hundred fifty-five million, one hundred twenty thousand, five hundred sixty-one".