813493937 has 4 divisors (see below), whose sum is σ = 813586980. Its totient is φ = 813400896.

The previous prime is 813493913. The next prime is 813493939. The reversal of 813493937 is 739394318.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 352275361 + 461218576 = 18769^2 + 21476^2 .

It is a cyclic number.

It is not a de Polignac number, because 813493937 - 2¹⁶ = 813428401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 813493891 and 813493900.

It is not an unprimeable number, because it can be changed into a prime (813493939) 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 3 ways as a sum of consecutive naturals, for example, 31868 + ... + 51405.

It is an arithmetic number, because the mean of its divisors is an integer number (203396745).

Almost surely, 2^813493937 is an apocalyptic number.

It is an amenable number.

813493937 is a deficient number, since it is larger than the sum of its proper divisors (93043).

813493937 is an equidigital number, since it uses as much as digits as its factorization.

813493937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93042.

The product of its digits is 489888, while the sum is 47.

The square root of 813493937 is about 28521.8151070369. The cubic root of 813493937 is about 933.5081347627.

The spelling of 813493937 in words is "eight hundred thirteen million, four hundred ninety-three thousand, nine hundred thirty-seven".