206256397 has 2 divisors, whose sum is σ = 206256398. Its totient is φ = 206256396.

The previous prime is 206256353. The next prime is 206256437. The reversal of 206256397 is 793652602.

It is an a-pointer prime, because the next prime (206256437) can be obtained adding 206256397 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205234276 + 1022121 = 14326^2 + 1011^2 .

It is a cyclic number.

It is not a de Polignac number, because 206256397 - 2¹⁵ = 206223629 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206256097) 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, 103128198 + 103128199.

It is an arithmetic number, because the mean of its divisors is an integer number (103128199).

Almost surely, 2^206256397 is an apocalyptic number.

It is an amenable number.

206256397 is a deficient number, since it is larger than the sum of its proper divisors (1).

206256397 is an equidigital number, since it uses as much as digits as its factorization.

206256397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 206256397 is about 14361.6293295712. The cubic root of 206256397 is about 590.8389835470.

The spelling of 206256397 in words is "two hundred six million, two hundred fifty-six thousand, three hundred ninety-seven".