871748561 has 2 divisors, whose sum is σ = 871748562. Its totient is φ = 871748560.

The previous prime is 871748533. The next prime is 871748573. The reversal of 871748561 is 165847178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 832611025 + 39137536 = 28855^2 + 6256^2 .

It is a cyclic number.

It is not a de Polignac number, because 871748561 - 2²⁶ = 804639697 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (871748161) 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, 435874280 + 435874281.

It is an arithmetic number, because the mean of its divisors is an integer number (435874281).

Almost surely, 2^871748561 is an apocalyptic number.

It is an amenable number.

871748561 is a deficient number, since it is larger than the sum of its proper divisors (1).

871748561 is an equidigital number, since it uses as much as digits as its factorization.

871748561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376320, while the sum is 47.

The square root of 871748561 is about 29525.3884140412. The cubic root of 871748561 is about 955.2794010844.

The spelling of 871748561 in words is "eight hundred seventy-one million, seven hundred forty-eight thousand, five hundred sixty-one".