10391321 has 2 divisors, whose sum is σ = 10391322. Its totient is φ = 10391320.

The previous prime is 10391317. The next prime is 10391341. The reversal of 10391321 is 12319301.

It is an a-pointer prime, because the next prime (10391341) can be obtained adding 10391321 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10240000 + 151321 = 3200^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 10391321 - 2² = 10391317 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 10391293 and 10391302.

It is not a weakly prime, because it can be changed into another prime (10391341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5195660 + 5195661.

It is an arithmetic number, because the mean of its divisors is an integer number (5195661).

Almost surely, 2^10391321 is an apocalyptic number.

It is an amenable number.

10391321 is a deficient number, since it is larger than the sum of its proper divisors (1).

10391321 is an equidigital number, since it uses as much as digits as its factorization.

10391321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 10391321 is about 3223.5571966385. The cubic root of 10391321 is about 218.2178404907.

The spelling of 10391321 in words is "ten million, three hundred ninety-one thousand, three hundred twenty-one".