86181617891 has 2 divisors, whose sum is σ = 86181617892. Its totient is φ = 86181617890.

The previous prime is 86181617843. The next prime is 86181617927. The reversal of 86181617891 is 19871618168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86181617891 - 2³⁴ = 69001748707 is a prime.

It is not a weakly prime, because it can be changed into another prime (86181617831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43090808945 + 43090808946.

It is an arithmetic number, because the mean of its divisors is an integer number (43090808946).

Almost surely, 2^86181617891 is an apocalyptic number.

86181617891 is a deficient number, since it is larger than the sum of its proper divisors (1).

86181617891 is an equidigital number, since it uses as much as digits as its factorization.

86181617891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 56.

The spelling of 86181617891 in words is "eighty-six billion, one hundred eighty-one million, six hundred seventeen thousand, eight hundred ninety-one".