854561 has 4 divisors (see below), whose sum is σ = 863124. Its totient is φ = 846000.

The previous prime is 854533. The next prime is 854569. The reversal of 854561 is 165458.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165458 = 2 ⋅82729.

It can be written as a sum of positive squares in 2 ways, for example, as 776161 + 78400 = 881^2 + 280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-854561 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (854569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4130 + ... + 4331.

It is an arithmetic number, because the mean of its divisors is an integer number (215781).

2⁸⁵⁴⁵⁶¹ is an apocalyptic number.

It is an amenable number.

854561 is a deficient number, since it is larger than the sum of its proper divisors (8563).

854561 is a wasteful number, since it uses less digits than its factorization.

854561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8562.

The product of its digits is 4800, while the sum is 29.

The square root of 854561 is about 924.4246859534. The cubic root of 854561 is about 94.8959525671.

The spelling of 854561 in words is "eight hundred fifty-four thousand, five hundred sixty-one".