821163 has 8 divisors (see below), whose sum is σ = 1251328. Its totient is φ = 469224.

The previous prime is 821153. The next prime is 821167. The reversal of 821163 is 361128.

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

It is not a de Polignac number, because 821163 - 2⁴ = 821147 is a prime.

It is a super-3 number, since 3×821163³ = 1661151997478333241, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 39103 = 821163 / (8 + 2 + 1 + 1 + 6 + 3).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 821163.

It is not an unprimeable number, because it can be changed into a prime (821167) 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 7 ways as a sum of consecutive naturals, for example, 19531 + ... + 19572.

It is an arithmetic number, because the mean of its divisors is an integer number (156416).

2⁸²¹¹⁶³ is an apocalyptic number.

821163 is a deficient number, since it is larger than the sum of its proper divisors (430165).

821163 is a wasteful number, since it uses less digits than its factorization.

821163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39113.

The product of its digits is 288, while the sum is 21.

The square root of 821163 is about 906.1804456067. The cubic root of 821163 is about 93.6432455946.

The spelling of 821163 in words is "eight hundred twenty-one thousand, one hundred sixty-three".