86918891 has 2 divisors, whose sum is σ = 86918892. Its totient is φ = 86918890.

The previous prime is 86918869. The next prime is 86918911. The reversal of 86918891 is 19881968.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86918891 - 2⁶ = 86918827 is a prime.

It is a super-2 number, since 2×86918891² = 15109787225339762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86918801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43459445 + 43459446.

It is an arithmetic number, because the mean of its divisors is an integer number (43459446).

Almost surely, 2^86918891 is an apocalyptic number.

86918891 is a deficient number, since it is larger than the sum of its proper divisors (1).

86918891 is an equidigital number, since it uses as much as digits as its factorization.

86918891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 50.

The square root of 86918891 is about 9323.0301404640. The cubic root of 86918891 is about 442.9670190327.

The spelling of 86918891 in words is "eighty-six million, nine hundred eighteen thousand, eight hundred ninety-one".