818628913 has 4 divisors (see below), whose sum is σ = 826139380. Its totient is φ = 811118448.

The previous prime is 818628893. The next prime is 818628973. The reversal of 818628913 is 319826818.

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 316555264 + 502073649 = 17792^2 + 22407^2 .

It is a cyclic number.

It is not a de Polignac number, because 818628913 - 2⁹ = 818628401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818628973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3755070 + ... + 3755287.

It is an arithmetic number, because the mean of its divisors is an integer number (206534845).

Almost surely, 2^818628913 is an apocalyptic number.

It is an amenable number.

818628913 is a deficient number, since it is larger than the sum of its proper divisors (7510467).

818628913 is a wasteful number, since it uses less digits than its factorization.

818628913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7510466.

The product of its digits is 165888, while the sum is 46.

The square root of 818628913 is about 28611.6918933502. The cubic root of 818628913 is about 935.4681948862.

The spelling of 818628913 in words is "eight hundred eighteen million, six hundred twenty-eight thousand, nine hundred thirteen".