206820613 has 2 divisors, whose sum is σ = 206820614. Its totient is φ = 206820612.

The previous prime is 206820569. The next prime is 206820617. The reversal of 206820613 is 316028602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175483009 + 31337604 = 13247^2 + 5598^2 .

It is a cyclic number.

It is not a de Polignac number, because 206820613 - 2⁹ = 206820101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206820617) 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 as a sum of consecutive naturals, namely, 103410306 + 103410307.

It is an arithmetic number, because the mean of its divisors is an integer number (103410307).

Almost surely, 2^206820613 is an apocalyptic number.

It is an amenable number.

206820613 is a deficient number, since it is larger than the sum of its proper divisors (1).

206820613 is an equidigital number, since it uses as much as digits as its factorization.

206820613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 206820613 is about 14381.2590895234. The cubic root of 206820613 is about 591.3772412746.

The spelling of 206820613 in words is "two hundred six million, eight hundred twenty thousand, six hundred thirteen".