861330871 has 2 divisors, whose sum is σ = 861330872. Its totient is φ = 861330870.

The previous prime is 861330859. The next prime is 861330901. The reversal of 861330871 is 178033168.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861330871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 861330871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861330851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430665435 + 430665436.

It is an arithmetic number, because the mean of its divisors is an integer number (430665436).

Almost surely, 2^861330871 is an apocalyptic number.

861330871 is a deficient number, since it is larger than the sum of its proper divisors (1).

861330871 is an equidigital number, since it uses as much as digits as its factorization.

861330871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 861330871 is about 29348.4389874487. The cubic root of 861330871 is about 951.4588374906.

The spelling of 861330871 in words is "eight hundred sixty-one million, three hundred thirty thousand, eight hundred seventy-one".