10168721 has 2 divisors, whose sum is σ = 10168722. Its totient is φ = 10168720.

The previous prime is 10168699. The next prime is 10168727. The reversal of 10168721 is 12786101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6558721 + 3610000 = 2561^2 + 1900^2 .

It is an emirp because it is prime and its reverse (12786101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10168721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10168727) 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, 5084360 + 5084361.

It is an arithmetic number, because the mean of its divisors is an integer number (5084361).

Almost surely, 2^10168721 is an apocalyptic number.

It is an amenable number.

10168721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10168721 is an equidigital number, since it uses as much as digits as its factorization.

10168721 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 26.

The square root of 10168721 is about 3188.8432071834. The cubic root of 10168721 is about 216.6483789956.

The spelling of 10168721 in words is "ten million, one hundred sixty-eight thousand, seven hundred twenty-one".