871185551 has 2 divisors, whose sum is σ = 871185552. Its totient is φ = 871185550.

The previous prime is 871185541. The next prime is 871185599. The reversal of 871185551 is 155581178.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871185551 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 871185499 and 871185508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871185521) 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, 435592775 + 435592776.

It is an arithmetic number, because the mean of its divisors is an integer number (435592776).

Almost surely, 2^871185551 is an apocalyptic number.

871185551 is a deficient number, since it is larger than the sum of its proper divisors (1).

871185551 is an equidigital number, since it uses as much as digits as its factorization.

871185551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56000, while the sum is 41.

The square root of 871185551 is about 29515.8525372384. The cubic root of 871185551 is about 955.0737042793.

The spelling of 871185551 in words is "eight hundred seventy-one million, one hundred eighty-five thousand, five hundred fifty-one".