816481329 has 4 divisors (see below), whose sum is σ = 1088641776. Its totient is φ = 544320884.

The previous prime is 816481297. The next prime is 816481333. The reversal of 816481329 is 923184618.

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 816481329 - 2⁵ = 816481297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816481529) 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 3 ways as a sum of consecutive naturals, for example, 136080219 + ... + 136080224.

It is an arithmetic number, because the mean of its divisors is an integer number (272160444).

Almost surely, 2^816481329 is an apocalyptic number.

It is an amenable number.

816481329 is a deficient number, since it is larger than the sum of its proper divisors (272160447).

816481329 is a wasteful number, since it uses less digits than its factorization.

816481329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272160446.

The product of its digits is 82944, while the sum is 42.

The square root of 816481329 is about 28574.1374148022. The cubic root of 816481329 is about 934.6494454482.

The spelling of 816481329 in words is "eight hundred sixteen million, four hundred eighty-one thousand, three hundred twenty-nine".