7819243321 has 2 divisors, whose sum is σ = 7819243322. Its totient is φ = 7819243320.

The previous prime is 7819243309. The next prime is 7819243339. The reversal of 7819243321 is 1233429187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4285535296 + 3533708025 = 65464^2 + 59445^2 .

It is an emirp because it is prime and its reverse (1233429187) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7819243321 is a prime.

It is a super-2 number, since 2×7819243321² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7819243301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3909621660 + 3909621661.

It is an arithmetic number, because the mean of its divisors is an integer number (3909621661).

Almost surely, 2^7819243321 is an apocalyptic number.

It is an amenable number.

7819243321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7819243321 is an equidigital number, since it uses as much as digits as its factorization.

7819243321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 7819243321 is about 88426.4854045438. The cubic root of 7819243321 is about 1984.8220497081.

The spelling of 7819243321 in words is "seven billion, eight hundred nineteen million, two hundred forty-three thousand, three hundred twenty-one".