205140269 has 2 divisors, whose sum is σ = 205140270. Its totient is φ = 205140268.

The previous prime is 205140253. The next prime is 205140281. The reversal of 205140269 is 962041502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119355625 + 85784644 = 10925^2 + 9262^2 .

It is a cyclic number.

It is not a de Polignac number, because 205140269 - 2⁴ = 205140253 is a prime.

It is a super-2 number, since 2×205140269² = 84165059930784722, which contains 22 as substring.

It is a Sophie Germain prime.

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 (205140569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102570134 + 102570135.

It is an arithmetic number, because the mean of its divisors is an integer number (102570135).

Almost surely, 2^205140269 is an apocalyptic number.

It is an amenable number.

205140269 is a deficient number, since it is larger than the sum of its proper divisors (1).

205140269 is an equidigital number, since it uses as much as digits as its factorization.

205140269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 205140269 is about 14322.7186316006. The cubic root of 205140269 is about 589.7713075175.

The spelling of 205140269 in words is "two hundred five million, one hundred forty thousand, two hundred sixty-nine".