864187871 has 2 divisors, whose sum is σ = 864187872. Its totient is φ = 864187870.

The previous prime is 864187853. The next prime is 864187879. The reversal of 864187871 is 178781468.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 864187871 - 2¹⁴ = 864171487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864187879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432093935 + 432093936.

It is an arithmetic number, because the mean of its divisors is an integer number (432093936).

Almost surely, 2^864187871 is an apocalyptic number.

864187871 is a deficient number, since it is larger than the sum of its proper divisors (1).

864187871 is an equidigital number, since it uses as much as digits as its factorization.

864187871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 602112, while the sum is 50.

The square root of 864187871 is about 29397.0724903008. The cubic root of 864187871 is about 952.5096601184.

The spelling of 864187871 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred seventy-one".