8133813 has 6 divisors (see below), whose sum is σ = 11748854. Its totient is φ = 5422536.

The previous prime is 8133809. The next prime is 8133841. The reversal of 8133813 is 3183318.

It can be written as a sum of positive squares in only one way, i.e., 5116644 + 3017169 = 2262^2 + 1737^2 .

It is not a de Polignac number, because 8133813 - 2² = 8133809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8133883) 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 5 ways as a sum of consecutive naturals, for example, 451870 + ... + 451887.

Almost surely, 2^8133813 is an apocalyptic number.

It is an amenable number.

8133813 is a deficient number, since it is larger than the sum of its proper divisors (3615041).

8133813 is a wasteful number, since it uses less digits than its factorization.

8133813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903763 (or 903760 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 8133813 is about 2851.9840462387. The cubic root of 8133813 is about 201.1089481389.

The spelling of 8133813 in words is "eight million, one hundred thirty-three thousand, eight hundred thirteen".