871090009 has 2 divisors, whose sum is σ = 871090010. Its totient is φ = 871090008.

The previous prime is 871089931. The next prime is 871090019. The reversal of 871090009 is 900090178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864536409 + 6553600 = 29403^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 871090009 - 2¹¹ = 871087961 is a prime.

It is not a weakly prime, because it can be changed into another prime (871090019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435545004 + 435545005.

It is an arithmetic number, because the mean of its divisors is an integer number (435545005).

Almost surely, 2^871090009 is an apocalyptic number.

It is an amenable number.

871090009 is a deficient number, since it is larger than the sum of its proper divisors (1).

871090009 is an equidigital number, since it uses as much as digits as its factorization.

871090009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 871090009 is about 29514.2340066619. The cubic root of 871090009 is about 955.0387890278.

The spelling of 871090009 in words is "eight hundred seventy-one million, ninety thousand, nine".