2871721091 has 2 divisors, whose sum is σ = 2871721092. Its totient is φ = 2871721090.

The previous prime is 2871721063. The next prime is 2871721117. The reversal of 2871721091 is 1901271782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2871721091 is a prime.

It is not a weakly prime, because it can be changed into another prime (2871721891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1435860545 + 1435860546.

It is an arithmetic number, because the mean of its divisors is an integer number (1435860546).

Almost surely, 2^2871721091 is an apocalyptic number.

2871721091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2871721091 is an equidigital number, since it uses as much as digits as its factorization.

2871721091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 38.

The square root of 2871721091 is about 53588.4417668586. The cubic root of 2871721091 is about 1421.3927172752.

The spelling of 2871721091 in words is "two billion, eight hundred seventy-one million, seven hundred twenty-one thousand, ninety-one".