813216769 has 4 divisors (see below), whose sum is σ = 839449600. Its totient is φ = 786983940.

The previous prime is 813216671. The next prime is 813216779. The reversal of 813216769 is 967612318.

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 813216769 - 2¹⁷ = 813085697 is a prime.

It is a super-2 number, since 2×813216769² = 1322643026765598722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813216779) 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, 13116369 + ... + 13116430.

It is an arithmetic number, because the mean of its divisors is an integer number (209862400).

Almost surely, 2^813216769 is an apocalyptic number.

It is an amenable number.

813216769 is a deficient number, since it is larger than the sum of its proper divisors (26232831).

813216769 is a wasteful number, since it uses less digits than its factorization.

813216769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26232830.

The product of its digits is 108864, while the sum is 43.

The square root of 813216769 is about 28516.9558157949. The cubic root of 813216769 is about 933.4021032519.

The spelling of 813216769 in words is "eight hundred thirteen million, two hundred sixteen thousand, seven hundred sixty-nine".