8921087999909 has 2 divisors, whose sum is σ = 8921087999910. Its totient is φ = 8921087999908.

The previous prime is 8921087999903. The next prime is 8921087999917. The reversal of 8921087999909 is 9099997801298.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8792796520225 + 128291479684 = 2965265^2 + 358178^2 .

It is a cyclic number.

It is not a de Polignac number, because 8921087999909 - 2⁴⁰ = 7821576372133 is a prime.

It is a super-2 number, since 2×8921087999909² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8921087999903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4460543999954 + 4460543999955.

It is an arithmetic number, because the mean of its divisors is an integer number (4460543999955).

Almost surely, 2^{8921087999909} is an apocalyptic number.

It is an amenable number.

8921087999909 is a deficient number, since it is larger than the sum of its proper divisors (1).

8921087999909 is an equidigital number, since it uses as much as digits as its factorization.

8921087999909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 476171136, while the sum is 80.

The spelling of 8921087999909 in words is "eight trillion, nine hundred twenty-one billion, eighty-seven million, nine hundred ninety-nine thousand, nine hundred nine".