7912321 has 2 divisors, whose sum is σ = 7912322. Its totient is φ = 7912320.

The previous prime is 7912319. The next prime is 7912343. The reversal of 7912321 is 1232197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5475600 + 2436721 = 2340^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 7912321 - 2¹ = 7912319 is a prime.

Together with 7912319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7912351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3956160 + 3956161.

It is an arithmetic number, because the mean of its divisors is an integer number (3956161).

Almost surely, 2^7912321 is an apocalyptic number.

It is an amenable number.

7912321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7912321 is an equidigital number, since it uses as much as digits as its factorization.

7912321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 7912321 is about 2812.8848181182. The cubic root of 7912321 is about 199.2666559860.

The spelling of 7912321 in words is "seven million, nine hundred twelve thousand, three hundred twenty-one".