854861120569 has 9 divisors (see below), whose sum is σ = 863025019311. Its totient is φ = 846773758080.

The previous prime is 854861120563. The next prime is 854861120629. The reversal of 854861120569 is 965021168458.

The square root of 854861120569 is 924587.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 23773630969 + 831087489600 = 154187^2 + 911640^2 .

It is not a de Polignac number, because 854861120569 - 2¹³ = 854861112377 is a prime.

It is a super-2 number, since 2×854861120569² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (854861120563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 98926489 + ... + 98935129.

Almost surely, 2^854861120569 is an apocalyptic number.

854861120569 is the 924587-th square number.

854861120569 is the 462294-th centered octagonal number.

It is an amenable number.

854861120569 is a deficient number, since it is larger than the sum of its proper divisors (8163898742).

854861120569 is an frugal number, since it uses more digits than its factorization.

854861120569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17496 (or 8748 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 55.

The spelling of 854861120569 in words is "eight hundred fifty-four billion, eight hundred sixty-one million, one hundred twenty thousand, five hundred sixty-nine".