2871721117 has 2 divisors, whose sum is σ = 2871721118. Its totient is φ = 2871721116.

The previous prime is 2871721091. The next prime is 2871721133. The reversal of 2871721117 is 7111271782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2333759481 + 537961636 = 48309^2 + 23194^2 .

It is a cyclic number.

It is not a de Polignac number, because 2871721117 - 2⁷ = 2871720989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2871721187) 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, 1435860558 + 1435860559.

It is an arithmetic number, because the mean of its divisors is an integer number (1435860559).

Almost surely, 2^2871721117 is an apocalyptic number.

It is an amenable number.

2871721117 is a deficient number, since it is larger than the sum of its proper divisors (1).

2871721117 is an equidigital number, since it uses as much as digits as its factorization.

2871721117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10976, while the sum is 37.

The square root of 2871721117 is about 53588.4420094483. The cubic root of 2871721117 is about 1421.3927215648.

Adding to 2871721117 its reverse (7111271782), we get a palindrome (9982992899).

The spelling of 2871721117 in words is "two billion, eight hundred seventy-one million, seven hundred twenty-one thousand, one hundred seventeen".