206525591 has 2 divisors, whose sum is σ = 206525592. Its totient is φ = 206525590.

The previous prime is 206525587. The next prime is 206525593. The reversal of 206525591 is 195525602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206525591 - 2² = 206525587 is a prime.

Together with 206525593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206525593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103262795 + 103262796.

It is an arithmetic number, because the mean of its divisors is an integer number (103262796).

Almost surely, 2^206525591 is an apocalyptic number.

206525591 is a deficient number, since it is larger than the sum of its proper divisors (1).

206525591 is an equidigital number, since it uses as much as digits as its factorization.

206525591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 206525591 is about 14370.9982603854. The cubic root of 206525591 is about 591.0959148347.

The spelling of 206525591 in words is "two hundred six million, five hundred twenty-five thousand, five hundred ninety-one".