7871540771 has 2 divisors, whose sum is σ = 7871540772. Its totient is φ = 7871540770.

The previous prime is 7871540767. The next prime is 7871540773. The reversal of 7871540771 is 1770451787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7871540771 - 2² = 7871540767 is a prime.

It is a super-2 number, since 2×7871540771² (a number of 21 digits) contains 22 as substring.

Together with 7871540773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7871540773) 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, 3935770385 + 3935770386.

It is an arithmetic number, because the mean of its divisors is an integer number (3935770386).

Almost surely, 2^7871540771 is an apocalyptic number.

7871540771 is a deficient number, since it is larger than the sum of its proper divisors (1).

7871540771 is an equidigital number, since it uses as much as digits as its factorization.

7871540771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384160, while the sum is 47.

The square root of 7871540771 is about 88721.7040582517. The cubic root of 7871540771 is about 1989.2372497470.

The spelling of 7871540771 in words is "seven billion, eight hundred seventy-one million, five hundred forty thousand, seven hundred seventy-one".