8128213 has 2 divisors, whose sum is σ = 8128214. Its totient is φ = 8128212.

The previous prime is 8128187. The next prime is 8128217. The reversal of 8128213 is 3128218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7193124 + 935089 = 2682^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 8128213 - 2¹⁷ = 7997141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8128217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4064106 + 4064107.

It is an arithmetic number, because the mean of its divisors is an integer number (4064107).

Almost surely, 2^8128213 is an apocalyptic number.

It is an amenable number.

8128213 is a deficient number, since it is larger than the sum of its proper divisors (1).

8128213 is an equidigital number, since it uses as much as digits as its factorization.

8128213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 25.

The square root of 8128213 is about 2851.0021045240. The cubic root of 8128213 is about 201.0627841128.

It can be divided in two parts, 812 and 8213, that added together give a square (9025 = 95²).

The spelling of 8128213 in words is "eight million, one hundred twenty-eight thousand, two hundred thirteen".