815481 has 8 divisors (see below), whose sum is σ = 1208160. Its totient is φ = 543636.

The previous prime is 815471. The next prime is 815491. The reversal of 815481 is 184518.

It is an interprime number because it is at equal distance from previous prime (815471) and next prime (815491).

It is not a de Polignac number, because 815481 - 2⁶ = 815417 is a prime.

It is a super-2 number, since 2×815481² = 1330018522722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 30203 = 815481 / (8 + 1 + 5 + 4 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (815401) 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, 15075 + ... + 15128.

It is an arithmetic number, because the mean of its divisors is an integer number (151020).

2⁸¹⁵⁴⁸¹ is an apocalyptic number.

It is an amenable number.

815481 is a deficient number, since it is larger than the sum of its proper divisors (392679).

815481 is a wasteful number, since it uses less digits than its factorization.

815481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30212 (or 30206 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 815481 is about 903.0398662296. The cubic root of 815481 is about 93.4267587754.

815481 divided by its sum of digits (27) gives a palindrome (30203).

Adding to 815481 its reverse (184518), we get a palindrome (999999).

It can be divided in two parts, 815 and 481, that added together give a 4-th power (1296 = 6⁴).

The spelling of 815481 in words is "eight hundred fifteen thousand, four hundred eighty-one".