206356261 has 2 divisors, whose sum is σ = 206356262. Its totient is φ = 206356260.

The previous prime is 206356259. The next prime is 206356279. The reversal of 206356261 is 162653602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205033761 + 1322500 = 14319^2 + 1150^2 .

It is a cyclic number.

It is not a de Polignac number, because 206356261 - 2¹ = 206356259 is a prime.

Together with 206356259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206356361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103178130 + 103178131.

It is an arithmetic number, because the mean of its divisors is an integer number (103178131).

Almost surely, 2^206356261 is an apocalyptic number.

It is an amenable number.

206356261 is a deficient number, since it is larger than the sum of its proper divisors (1).

206356261 is an equidigital number, since it uses as much as digits as its factorization.

206356261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 206356261 is about 14365.1056731233. The cubic root of 206356261 is about 590.9343244674.

It can be divided in two parts, 20635 and 6261, that added together give a square (26896 = 164²).

The spelling of 206356261 in words is "two hundred six million, three hundred fifty-six thousand, two hundred sixty-one".