816324281 has 4 divisors (see below), whose sum is σ = 819985152. Its totient is φ = 812663412.

The previous prime is 816324239. The next prime is 816324283. The reversal of 816324281 is 182423618.

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 816324281 - 2¹⁰ = 816323257 is a prime.

It is a super-2 number, since 2×816324281² = 1332770663500333922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816324283) 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, 1830101 + ... + 1830546.

It is an arithmetic number, because the mean of its divisors is an integer number (204996288).

Almost surely, 2^816324281 is an apocalyptic number.

It is an amenable number.

816324281 is a deficient number, since it is larger than the sum of its proper divisors (3660871).

816324281 is a wasteful number, since it uses less digits than its factorization.

816324281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3660870.

The product of its digits is 18432, while the sum is 35.

The square root of 816324281 is about 28571.3892031872. The cubic root of 816324281 is about 934.5895158319.

Adding to 816324281 its reverse (182423618), we get a palindrome (998747899).

The spelling of 816324281 in words is "eight hundred sixteen million, three hundred twenty-four thousand, two hundred eighty-one".