268721239 has 2 divisors, whose sum is σ = 268721240. Its totient is φ = 268721238.

The previous prime is 268721209. The next prime is 268721251. The reversal of 268721239 is 932127862.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 268721239 - 2⁵ = 268721207 is a prime.

It is a super-2 number, since 2×268721239² = 144422208579390242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268721209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134360619 + 134360620.

It is an arithmetic number, because the mean of its divisors is an integer number (134360620).

Almost surely, 2^268721239 is an apocalyptic number.

268721239 is a deficient number, since it is larger than the sum of its proper divisors (1).

268721239 is an equidigital number, since it uses as much as digits as its factorization.

268721239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 268721239 is about 16392.7190850084. The cubic root of 268721239 is about 645.3084188924.

The spelling of 268721239 in words is "two hundred sixty-eight million, seven hundred twenty-one thousand, two hundred thirty-nine".