8921579939 has 2 divisors, whose sum is σ = 8921579940. Its totient is φ = 8921579938.

The previous prime is 8921579911. The next prime is 8921579969. The reversal of 8921579939 is 9399751298.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8921579939 is a prime.

It is a super-3 number, since 3×8921579939³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (8921579969) 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, 4460789969 + 4460789970.

It is an arithmetic number, because the mean of its divisors is an integer number (4460789970).

Almost surely, 2^8921579939 is an apocalyptic number.

8921579939 is a deficient number, since it is larger than the sum of its proper divisors (1).

8921579939 is an equidigital number, since it uses as much as digits as its factorization.

8921579939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11022480, while the sum is 62.

The square root of 8921579939 is about 94454.1155217707. The cubic root of 8921579939 is about 2074.0246978173.

The spelling of 8921579939 in words is "eight billion, nine hundred twenty-one million, five hundred seventy-nine thousand, nine hundred thirty-nine".