263981339 has 2 divisors, whose sum is σ = 263981340. Its totient is φ = 263981338.

The previous prime is 263981317. The next prime is 263981351. The reversal of 263981339 is 933189362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 263981339 - 2¹² = 263977243 is a prime.

It is a super-2 number, since 2×263981339² = 139372294680465842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263981339.

It is not a weakly prime, because it can be changed into another prime (263981309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131990669 + 131990670.

It is an arithmetic number, because the mean of its divisors is an integer number (131990670).

Almost surely, 2^263981339 is an apocalyptic number.

263981339 is a deficient number, since it is larger than the sum of its proper divisors (1).

263981339 is an equidigital number, since it uses as much as digits as its factorization.

263981339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 44.

The square root of 263981339 is about 16247.5025465454. The cubic root of 263981339 is about 641.4917505425.

The spelling of 263981339 in words is "two hundred sixty-three million, nine hundred eighty-one thousand, three hundred thirty-nine".