861086100191 has 2 divisors, whose sum is σ = 861086100192. Its totient is φ = 861086100190.

The previous prime is 861086100181. The next prime is 861086100209. The reversal of 861086100191 is 191001680168.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 861086100191 - 2¹⁴ = 861086083807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (861086100131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430543050095 + 430543050096.

It is an arithmetic number, because the mean of its divisors is an integer number (430543050096).

Almost surely, 2^861086100191 is an apocalyptic number.

861086100191 is a deficient number, since it is larger than the sum of its proper divisors (1).

861086100191 is an equidigital number, since it uses as much as digits as its factorization.

861086100191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 41.

The spelling of 861086100191 in words is "eight hundred sixty-one billion, eighty-six million, one hundred thousand, one hundred ninety-one".