818901 has 6 divisors (see below), whose sum is σ = 1182870. Its totient is φ = 545928.

The previous prime is 818897. The next prime is 818947. The reversal of 818901 is 109818.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 62001 = 870^2 + 249^2 .

It is not a de Polignac number, because 818901 - 2² = 818897 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 45486 + ... + 45503.

It is an arithmetic number, because the mean of its divisors is an integer number (197145).

2⁸¹⁸⁹⁰¹ is an apocalyptic number.

It is an amenable number.

818901 is a deficient number, since it is larger than the sum of its proper divisors (363969).

818901 is a wasteful number, since it uses less digits than its factorization.

818901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90995 (or 90992 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 818901 is about 904.9314891195. The cubic root of 818901 is about 93.5571823664.

The spelling of 818901 in words is "eight hundred eighteen thousand, nine hundred one".