263742569 has 2 divisors, whose sum is σ = 263742570. Its totient is φ = 263742568.

The previous prime is 263742533. The next prime is 263742571. The reversal of 263742569 is 965247362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 263640169 + 102400 = 16237^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 263742569 - 2¹² = 263738473 is a prime.

It is a super-2 number, since 2×263742569² = 139120285405439522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 263742571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (263742509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131871284 + 131871285.

It is an arithmetic number, because the mean of its divisors is an integer number (131871285).

Almost surely, 2^263742569 is an apocalyptic number.

It is an amenable number.

263742569 is a deficient number, since it is larger than the sum of its proper divisors (1).

263742569 is an equidigital number, since it uses as much as digits as its factorization.

263742569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 44.

The square root of 263742569 is about 16240.1529857326. The cubic root of 263742569 is about 641.2982833460.

The spelling of 263742569 in words is "two hundred sixty-three million, seven hundred forty-two thousand, five hundred sixty-nine".