253743569 has 2 divisors, whose sum is σ = 253743570. Its totient is φ = 253743568.

The previous prime is 253743491. The next prime is 253743599. The reversal of 253743569 is 965347352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248850625 + 4892944 = 15775^2 + 2212^2 .

It is a cyclic number.

It is not a de Polignac number, because 253743569 - 2⁸ = 253743313 is a prime.

It is a super-2 number, since 2×253743569² = 128771597617715522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (253743599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126871784 + 126871785.

It is an arithmetic number, because the mean of its divisors is an integer number (126871785).

Almost surely, 2^253743569 is an apocalyptic number.

It is an amenable number.

253743569 is a deficient number, since it is larger than the sum of its proper divisors (1).

253743569 is an equidigital number, since it uses as much as digits as its factorization.

253743569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 44.

The square root of 253743569 is about 15929.3304630170. The cubic root of 253743569 is about 633.0893601067.

The spelling of 253743569 in words is "two hundred fifty-three million, seven hundred forty-three thousand, five hundred sixty-nine".