871238591 has 2 divisors, whose sum is σ = 871238592. Its totient is φ = 871238590.

The previous prime is 871238579. The next prime is 871238629. The reversal of 871238591 is 195832178.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 871238591 - 2⁶ = 871238527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871238891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435619295 + 435619296.

It is an arithmetic number, because the mean of its divisors is an integer number (435619296).

Almost surely, 2^871238591 is an apocalyptic number.

871238591 is a deficient number, since it is larger than the sum of its proper divisors (1).

871238591 is an equidigital number, since it uses as much as digits as its factorization.

871238591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 871238591 is about 29516.7510237831. The cubic root of 871238591 is about 955.0930863276.

The spelling of 871238591 in words is "eight hundred seventy-one million, two hundred thirty-eight thousand, five hundred ninety-one".