205743269 has 2 divisors, whose sum is σ = 205743270. Its totient is φ = 205743268.

The previous prime is 205743253. The next prime is 205743271. The reversal of 205743269 is 962347502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129390625 + 76352644 = 11375^2 + 8738^2 .

It is a cyclic number.

It is not a de Polignac number, because 205743269 - 2⁴ = 205743253 is a prime.

It is a super-2 number, since 2×205743269² = 84660585477612722, which contains 22 as substring.

Together with 205743271, 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 (205748269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102871634 + 102871635.

It is an arithmetic number, because the mean of its divisors is an integer number (102871635).

Almost surely, 2^205743269 is an apocalyptic number.

It is an amenable number.

205743269 is a deficient number, since it is larger than the sum of its proper divisors (1).

205743269 is an equidigital number, since it uses as much as digits as its factorization.

205743269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 205743269 is about 14343.7536579516. The cubic root of 205743269 is about 590.3486104098.

The spelling of 205743269 in words is "two hundred five million, seven hundred forty-three thousand, two hundred sixty-nine".