819481 has 8 divisors (see below), whose sum is σ = 890120. Its totient is φ = 754416.

The previous prime is 819473. The next prime is 819487. The reversal of 819481 is 184918.

It can be written as a sum of positive squares in 4 ways, for example, as 234256 + 585225 = 484^2 + 765^2 .

It is not a de Polignac number, because 819481 - 2³ = 819473 is a prime.

It is a super-2 number, since 2×819481² = 1343098218722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819487) 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 7 ways as a sum of consecutive naturals, for example, 2011 + ... + 2383.

It is an arithmetic number, because the mean of its divisors is an integer number (111265).

2⁸¹⁹⁴⁸¹ is an apocalyptic number.

It is an amenable number.

819481 is a deficient number, since it is larger than the sum of its proper divisors (70639).

819481 is an equidigital number, since it uses as much as digits as its factorization.

819481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 386 counting only the distinct ones).

The product of its digits is 2304, while the sum is 31.

The square root of 819481 is about 905.2518986448. The cubic root of 819481 is about 93.5792649543.

The spelling of 819481 in words is "eight hundred nineteen thousand, four hundred eighty-one".