7945321 has 2 divisors, whose sum is σ = 7945322. Its totient is φ = 7945320.

The previous prime is 7945319. The next prime is 7945361. The reversal of 7945321 is 1235497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4665600 + 3279721 = 2160^2 + 1811^2 .

It is an emirp because it is prime and its reverse (1235497) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7945321 - 2¹ = 7945319 is a prime.

Together with 7945319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7945361) 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, 3972660 + 3972661.

It is an arithmetic number, because the mean of its divisors is an integer number (3972661).

Almost surely, 2^7945321 is an apocalyptic number.

It is an amenable number.

7945321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7945321 is an equidigital number, since it uses as much as digits as its factorization.

7945321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 7945321 is about 2818.7445787088. The cubic root of 7945321 is about 199.5432995841.

The spelling of 7945321 in words is "seven million, nine hundred forty-five thousand, three hundred twenty-one".