86868581 has 2 divisors, whose sum is σ = 86868582. Its totient is φ = 86868580.

The previous prime is 86868577. The next prime is 86868583. The reversal of 86868581 is 18586868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80263681 + 6604900 = 8959^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 86868581 - 2² = 86868577 is a prime.

It is a super-2 number, since 2×86868581² = 15092300729907122, which contains 22 as substring.

Together with 86868583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86868583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43434290 + 43434291.

It is an arithmetic number, because the mean of its divisors is an integer number (43434291).

Almost surely, 2^86868581 is an apocalyptic number.

It is an amenable number.

86868581 is a deficient number, since it is larger than the sum of its proper divisors (1).

86868581 is an equidigital number, since it uses as much as digits as its factorization.

86868581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 737280, while the sum is 50.

The square root of 86868581 is about 9320.3315928136. The cubic root of 86868581 is about 442.8815371479.

The spelling of 86868581 in words is "eighty-six million, eight hundred sixty-eight thousand, five hundred eighty-one".