86856481 has 2 divisors, whose sum is σ = 86856482. Its totient is φ = 86856480.

The previous prime is 86856463. The next prime is 86856521. The reversal of 86856481 is 18465868.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80013025 + 6843456 = 8945^2 + 2616^2 .

It is a cyclic number.

It is not a de Polignac number, because 86856481 - 2⁵ = 86856449 is a prime.

It is a super-2 number, since 2×86856481² = 15088096583406722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86856401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43428240 + 43428241.

It is an arithmetic number, because the mean of its divisors is an integer number (43428241).

Almost surely, 2^86856481 is an apocalyptic number.

It is an amenable number.

86856481 is a deficient number, since it is larger than the sum of its proper divisors (1).

86856481 is an equidigital number, since it uses as much as digits as its factorization.

86856481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 368640, while the sum is 46.

The square root of 86856481 is about 9319.6824516718. The cubic root of 86856481 is about 442.8609730752.

The spelling of 86856481 in words is "eighty-six million, eight hundred fifty-six thousand, four hundred eighty-one".