813219290 has 16 divisors (see below), whose sum is σ = 1576394568. Its totient is φ = 300265536.

The previous prime is 813219287. The next prime is 813219307. The reversal of 813219290 is 92912318.

It is a Cunningham number, because it is equal to 28517²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 603635761 + 209583529 = 24569^2 + 14477^2 .

It is a super-2 number, since 2×813219290² = 1322651227256208200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 813219290.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3127637 + ... + 3127896.

Almost surely, 2^813219290 is an apocalyptic number.

813219290 is a deficient number, since it is larger than the sum of its proper divisors (763175278).

813219290 is a wasteful number, since it uses less digits than its factorization.

813219290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6255553.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 813219290 is about 28517.0000175334. Note that the first 4 decimals coincide. The cubic root of 813219290 is about 933.4030677772.

The spelling of 813219290 in words is "eight hundred thirteen million, two hundred nineteen thousand, two hundred ninety".