813491365 has 8 divisors (see below), whose sum is σ = 1027568160. Its totient is φ = 616540752.

The previous prime is 813491359. The next prime is 813491387. The reversal of 813491365 is 563194318.

813491365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-813491365 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281439 + ... + 4281628.

It is an arithmetic number, because the mean of its divisors is an integer number (128446020).

Almost surely, 2^813491365 is an apocalyptic number.

It is an amenable number.

813491365 is a deficient number, since it is larger than the sum of its proper divisors (214076795).

813491365 is a wasteful number, since it uses less digits than its factorization.

813491365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8563091.

The product of its digits is 77760, while the sum is 40.

The square root of 813491365 is about 28521.7700187068. The cubic root of 813491365 is about 933.5071509465.

It can be divided in two parts, 8134 and 91365, that added together give a palindrome (99499).

The spelling of 813491365 in words is "eight hundred thirteen million, four hundred ninety-one thousand, three hundred sixty-five".