308213 has 2 divisors, whose sum is σ = 308214. Its totient is φ = 308212.

The previous prime is 308153. The next prime is 308219. The reversal of 308213 is 312803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 289444 + 18769 = 538^2 + 137^2 .

It is a cyclic number.

It is not a de Polignac number, because 308213 - 2⁶ = 308149 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 308191 and 308200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154106 + 154107.

It is an arithmetic number, because the mean of its divisors is an integer number (154107).

2³⁰⁸²¹³ is an apocalyptic number.

It is an amenable number.

308213 is a deficient number, since it is larger than the sum of its proper divisors (1).

308213 is an equidigital number, since it uses as much as digits as its factorization.

308213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 308213 is about 555.1693435340. The cubic root of 308213 is about 67.5486982827.

The spelling of 308213 in words is "three hundred eight thousand, two hundred thirteen".