809299951321 has 3 divisors (see below), whose sum is σ = 809300850933. Its totient is φ = 809299051710.

The previous prime is 809299951307. The next prime is 809299951349. The reversal of 809299951321 is 123159992908.

The square root of 809299951321 is 899611.

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 is not a de Polignac number, because 809299951321 - 2⁷ = 809299951193 is a prime.

It is a super-2 number, since 2×809299951321² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (806299951321) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 449806 + ... + 1349416.

It is an arithmetic number, because the mean of its divisors is an integer number (269766950311).

Almost surely, 2^809299951321 is an apocalyptic number.

809299951321 is the 899611-st square number.

809299951321 is the 449806-th centered octagonal number.

It is an amenable number.

809299951321 is a deficient number, since it is larger than the sum of its proper divisors (899612).

809299951321 is an frugal number, since it uses more digits than its factorization.

809299951321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799222 (or 899611 counting only the distinct ones).

The product of its (nonzero) digits is 3149280, while the sum is 58.

The spelling of 809299951321 in words is "eight hundred nine billion, two hundred ninety-nine million, nine hundred fifty-one thousand, three hundred twenty-one".