810439313 has 4 divisors (see below), whose sum is σ = 810498288. Its totient is φ = 810380340.

The previous prime is 810439309. The next prime is 810439327. The reversal of 810439313 is 313934018.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 810439313 - 2² = 810439309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 810439313.

It is not an unprimeable number, because it can be changed into a prime (810439393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3218 + ... + 40388.

It is an arithmetic number, because the mean of its divisors is an integer number (202624572).

Almost surely, 2^810439313 is an apocalyptic number.

It is an amenable number.

810439313 is a deficient number, since it is larger than the sum of its proper divisors (58975).

810439313 is a wasteful number, since it uses less digits than its factorization.

810439313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58974.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 810439313 is about 28468.2158380184. The cubic root of 810439313 is about 932.3382457275.

The spelling of 810439313 in words is "eight hundred ten million, four hundred thirty-nine thousand, three hundred thirteen".