861211112171 has 2 divisors, whose sum is σ = 861211112172. Its totient is φ = 861211112170.

The previous prime is 861211112161. The next prime is 861211112231. The reversal of 861211112171 is 171211112168.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-861211112171 is a prime.

It is not a weakly prime, because it can be changed into another prime (861211112161) 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, 430605556085 + 430605556086.

It is an arithmetic number, because the mean of its divisors is an integer number (430605556086).

Almost surely, 2^861211112171 is an apocalyptic number.

861211112171 is a deficient number, since it is larger than the sum of its proper divisors (1).

861211112171 is an equidigital number, since it uses as much as digits as its factorization.

861211112171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 32.

The spelling of 861211112171 in words is "eight hundred sixty-one billion, two hundred eleven million, one hundred twelve thousand, one hundred seventy-one".