8978722321 has 2 divisors, whose sum is σ = 8978722322. Its totient is φ = 8978722320.

The previous prime is 8978722297. The next prime is 8978722331. The reversal of 8978722321 is 1232278798.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8937055296 + 41667025 = 94536^2 + 6455^2 .

It is a cyclic number.

It is not a de Polignac number, because 8978722321 - 2²⁹ = 8441851409 is a prime.

It is not a weakly prime, because it can be changed into another prime (8978722331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4489361160 + 4489361161.

It is an arithmetic number, because the mean of its divisors is an integer number (4489361161).

Almost surely, 2^8978722321 is an apocalyptic number.

It is an amenable number.

8978722321 is a deficient number, since it is larger than the sum of its proper divisors (1).

8978722321 is an equidigital number, since it uses as much as digits as its factorization.

8978722321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 8978722321 is about 94756.1202297772. The cubic root of 8978722321 is about 2078.4432941301.

The spelling of 8978722321 in words is "eight billion, nine hundred seventy-eight million, seven hundred twenty-two thousand, three hundred twenty-one".