86818891 has 2 divisors, whose sum is σ = 86818892. Its totient is φ = 86818890.

The previous prime is 86818861. The next prime is 86818903. The reversal of 86818891 is 19881868.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86818891 - 2⁹ = 86818379 is a prime.

It is not a weakly prime, because it can be changed into another prime (86818811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43409445 + 43409446.

It is an arithmetic number, because the mean of its divisors is an integer number (43409446).

Almost surely, 2^86818891 is an apocalyptic number.

86818891 is a deficient number, since it is larger than the sum of its proper divisors (1).

86818891 is an equidigital number, since it uses as much as digits as its factorization.

86818891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 49.

The square root of 86818891 is about 9317.6655338126. The cubic root of 86818891 is about 442.7970763040.

The spelling of 86818891 in words is "eighty-six million, eight hundred eighteen thousand, eight hundred ninety-one".