813219289 has 3 divisors (see below), whose sum is σ = 813247807. Its totient is φ = 813190772.

The previous prime is 813219287. The next prime is 813219307. The reversal of 813219289 is 982912318.

The square root of 813219289 is 28517.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 707294025 + 105925264 = 26595^2 + 10292^2 .

It is not a de Polignac number, because 813219289 - 2¹ = 813219287 is a prime.

It is a super-2 number, since 2×813219289² = 1322651224003331042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813219287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 14259 + ... + 42775.

Almost surely, 2^813219289 is an apocalyptic number.

813219289 is the 28517-th square number.

813219289 is the 14259-th centered octagonal number.

It is an amenable number.

813219289 is a deficient number, since it is larger than the sum of its proper divisors (28518).

813219289 is an frugal number, since it uses more digits than its factorization.

813219289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57034 (or 28517 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The cubic root of 813219289 is about 933.4030673946.

The spelling of 813219289 in words is "eight hundred thirteen million, two hundred nineteen thousand, two hundred eighty-nine".