206569469 has 2 divisors, whose sum is σ = 206569470. Its totient is φ = 206569468.

The previous prime is 206569423. The next prime is 206569471. The reversal of 206569469 is 964965602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121837444 + 84732025 = 11038^2 + 9205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206569469 is a prime.

It is a super-2 number, since 2×206569469² = 85341891045883922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 206569471, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206569169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103284734 + 103284735.

It is an arithmetic number, because the mean of its divisors is an integer number (103284735).

Almost surely, 2^206569469 is an apocalyptic number.

It is an amenable number.

206569469 is a deficient number, since it is larger than the sum of its proper divisors (1).

206569469 is an equidigital number, since it uses as much as digits as its factorization.

206569469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 206569469 is about 14372.5247955952. The cubic root of 206569469 is about 591.1377728757.

The spelling of 206569469 in words is "two hundred six million, five hundred sixty-nine thousand, four hundred sixty-nine".