206220397 has 2 divisors, whose sum is σ = 206220398. Its totient is φ = 206220396.

The previous prime is 206220383. The next prime is 206220503. The reversal of 206220397 is 793022602.

206220397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187306596 + 18913801 = 13686^2 + 4349^2 .

It is a cyclic number.

It is not a de Polignac number, because 206220397 - 2²⁷ = 72002669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206220347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103110198 + 103110199.

It is an arithmetic number, because the mean of its divisors is an integer number (103110199).

Almost surely, 2^206220397 is an apocalyptic number.

It is an amenable number.

206220397 is a deficient number, since it is larger than the sum of its proper divisors (1).

206220397 is an equidigital number, since it uses as much as digits as its factorization.

206220397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 206220397 is about 14360.3759351906. The cubic root of 206220397 is about 590.8046065267.

Adding to 206220397 its reverse (793022602), we get a palindrome (999242999).

The spelling of 206220397 in words is "two hundred six million, two hundred twenty thousand, three hundred ninety-seven".