1068721 has 2 divisors, whose sum is σ = 1068722. Its totient is φ = 1068720.

The previous prime is 1068719. The next prime is 1068751. The reversal of 1068721 is 1278601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664225 + 404496 = 815^2 + 636^2 .

It is an emirp because it is prime and its reverse (1278601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1068721 - 2¹ = 1068719 is a prime.

It is a super-2 number, since 2×1068721² = 2284329151682, which contains 22 as substring.

Together with 1068719, it forms a pair of twin primes.

It is equal to p₈₃₄₅₅ and since 1068721 and 83455 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1068701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 534360 + 534361.

It is an arithmetic number, because the mean of its divisors is an integer number (534361).

2^1068721 is an apocalyptic number.

It is an amenable number.

1068721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1068721 is an equidigital number, since it uses as much as digits as its factorization.

1068721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1068721 is about 1033.7896304375. The cubic root of 1068721 is about 102.2401428796.

The spelling of 1068721 in words is "one million, sixty-eight thousand, seven hundred twenty-one".