206560391 has 2 divisors, whose sum is σ = 206560392. Its totient is φ = 206560390.

The previous prime is 206560369. The next prime is 206560427. The reversal of 206560391 is 193065602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206560391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206560351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103280195 + 103280196.

It is an arithmetic number, because the mean of its divisors is an integer number (103280196).

Almost surely, 2^206560391 is an apocalyptic number.

206560391 is a deficient number, since it is larger than the sum of its proper divisors (1).

206560391 is an equidigital number, since it uses as much as digits as its factorization.

206560391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 206560391 is about 14372.2089812248. The cubic root of 206560391 is about 591.1291132751.

The spelling of 206560391 in words is "two hundred six million, five hundred sixty thousand, three hundred ninety-one".