816481 has 4 divisors (see below), whose sum is σ = 824512. Its totient is φ = 808452.

The previous prime is 816469. The next prime is 816499. The reversal of 816481 is 184618.

816481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 816481 - 2⁷ = 816353 is a prime.

It is a super-2 number, since 2×816481² = 1333282446722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3861 + ... + 4066.

It is an arithmetic number, because the mean of its divisors is an integer number (206128).

2⁸¹⁶⁴⁸¹ is an apocalyptic number.

It is an amenable number.

816481 is a deficient number, since it is larger than the sum of its proper divisors (8031).

816481 is a wasteful number, since it uses less digits than its factorization.

816481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8030.

The product of its digits is 1536, while the sum is 28.

The square root of 816481 is about 903.5933820032. The cubic root of 816481 is about 93.4649319910.

The spelling of 816481 in words is "eight hundred sixteen thousand, four hundred eighty-one".