86784281 has 2 divisors, whose sum is σ = 86784282. Its totient is φ = 86784280.

The previous prime is 86784263. The next prime is 86784287. The reversal of 86784281 is 18248768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54760000 + 32024281 = 7400^2 + 5659^2 .

It is a cyclic number.

It is not a de Polignac number, because 86784281 - 2²⁶ = 19675417 is a prime.

It is a super-2 number, since 2×86784281² = 15063022857373922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86784287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43392140 + 43392141.

It is an arithmetic number, because the mean of its divisors is an integer number (43392141).

Almost surely, 2^86784281 is an apocalyptic number.

It is an amenable number.

86784281 is a deficient number, since it is larger than the sum of its proper divisors (1).

86784281 is an equidigital number, since it uses as much as digits as its factorization.

86784281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 44.

The square root of 86784281 is about 9315.8081238291. The cubic root of 86784281 is about 442.7382287286.

The spelling of 86784281 in words is "eighty-six million, seven hundred eighty-four thousand, two hundred eighty-one".