8539813 has 2 divisors, whose sum is σ = 8539814. Its totient is φ = 8539812.

The previous prime is 8539807. The next prime is 8539829. The reversal of 8539813 is 3189358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6640929 + 1898884 = 2577^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 8539813 - 2⁵ = 8539781 is a prime.

8539813 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8539213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4269906 + 4269907.

It is an arithmetic number, because the mean of its divisors is an integer number (4269907).

Almost surely, 2^8539813 is an apocalyptic number.

It is an amenable number.

8539813 is a deficient number, since it is larger than the sum of its proper divisors (1).

8539813 is an equidigital number, since it uses as much as digits as its factorization.

8539813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 8539813 is about 2922.2958440240. The cubic root of 8539813 is about 204.4008921113.

The spelling of 8539813 in words is "eight million, five hundred thirty-nine thousand, eight hundred thirteen".