205789069 has 2 divisors, whose sum is σ = 205789070. Its totient is φ = 205789068.

The previous prime is 205789037. The next prime is 205789123. The reversal of 205789069 is 960987502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196364169 + 9424900 = 14013^2 + 3070^2 .

It is a cyclic number.

It is not a de Polignac number, because 205789069 - 2⁵ = 205789037 is a prime.

It is a super-2 number, since 2×205789069² = 84698281839773522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205789009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102894534 + 102894535.

It is an arithmetic number, because the mean of its divisors is an integer number (102894535).

Almost surely, 2^205789069 is an apocalyptic number.

It is an amenable number.

205789069 is a deficient number, since it is larger than the sum of its proper divisors (1).

205789069 is an equidigital number, since it uses as much as digits as its factorization.

205789069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 205789069 is about 14345.3500828666. The cubic root of 205789069 is about 590.3924125075.

The spelling of 205789069 in words is "two hundred five million, seven hundred eighty-nine thousand, sixty-nine".