268721207 has 2 divisors, whose sum is σ = 268721208. Its totient is φ = 268721206.

The previous prime is 268721153. The next prime is 268721209. The reversal of 268721207 is 702127862.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-268721207 is a prime.

It is a super-2 number, since 2×268721207² = 144422174183073698, which contains 22 as substring.

Together with 268721209, 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 (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, 134360603 + 134360604.

It is an arithmetic number, because the mean of its divisors is an integer number (134360604).

Almost surely, 2^268721207 is an apocalyptic number.

268721207 is a deficient number, since it is larger than the sum of its proper divisors (1).

268721207 is an equidigital number, since it uses as much as digits as its factorization.

268721207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 268721207 is about 16392.7181089653. The cubic root of 268721207 is about 645.3083932775.

The spelling of 268721207 in words is "two hundred sixty-eight million, seven hundred twenty-one thousand, two hundred seven".