2009999870971 has 2 divisors, whose sum is σ = 2009999870972. Its totient is φ = 2009999870970.

The previous prime is 2009999870917. The next prime is 2009999870981. The reversal of 2009999870971 is 1790789999002.

Together with previous prime (2009999870917) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2009999870971 - 2¹¹ = 2009999868923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2009999870971.

It is not a weakly prime, because it can be changed into another prime (2009999870981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1004999935485 + 1004999935486.

It is an arithmetic number, because the mean of its divisors is an integer number (1004999935486).

Almost surely, 2^{2009999870971} is an apocalyptic number.

2009999870971 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009999870971 is an equidigital number, since it uses as much as digits as its factorization.

2009999870971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46294416, while the sum is 70.

The spelling of 2009999870971 in words is "two trillion, nine billion, nine hundred ninety-nine million, eight hundred seventy thousand, nine hundred seventy-one".