7924221817 has 2 divisors, whose sum is σ = 7924221818. Its totient is φ = 7924221816.

The previous prime is 7924221787. The next prime is 7924221859. The reversal of 7924221817 is 7181224297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5180976441 + 2743245376 = 71979^2 + 52376^2 .

It is a cyclic number.

It is not a de Polignac number, because 7924221817 - 2⁷ = 7924221689 is a prime.

It is not a weakly prime, because it can be changed into another prime (7924221887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3962110908 + 3962110909.

It is an arithmetic number, because the mean of its divisors is an integer number (3962110909).

Almost surely, 2^7924221817 is an apocalyptic number.

It is an amenable number.

7924221817 is a deficient number, since it is larger than the sum of its proper divisors (1).

7924221817 is an equidigital number, since it uses as much as digits as its factorization.

7924221817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 43.

The square root of 7924221817 is about 89018.0982553548. The cubic root of 7924221817 is about 1993.6651071685.

The spelling of 7924221817 in words is "seven billion, nine hundred twenty-four million, two hundred twenty-one thousand, eight hundred seventeen".