855001 has 6 divisors (see below), whose sum is σ = 994650. Its totient is φ = 732816.

The previous prime is 854999. The next prime is 855031. The reversal of 855001 is 100558.

It can be written as a sum of positive squares in only one way, i.e., 853776 + 1225 = 924^2 + 35^2 .

It is not a de Polignac number, because 855001 - 2¹ = 854999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 855001.

It is not an unprimeable number, because it can be changed into a prime (855031) 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 5 ways as a sum of consecutive naturals, for example, 8676 + ... + 8773.

It is an arithmetic number, because the mean of its divisors is an integer number (165775).

2⁸⁵⁵⁰⁰¹ is an apocalyptic number.

It is an amenable number.

855001 is a deficient number, since it is larger than the sum of its proper divisors (139649).

855001 is a wasteful number, since it uses less digits than its factorization.

855001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17463 (or 17456 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 855001 is about 924.6626411833. The cubic root of 855001 is about 94.9122365831.

Adding to 855001 its reverse (100558), we get a palindrome (955559).

The spelling of 855001 in words is "eight hundred fifty-five thousand, one".