86976781 has 2 divisors, whose sum is σ = 86976782. Its totient is φ = 86976780.

The previous prime is 86976749. The next prime is 86976817. The reversal of 86976781 is 18767968.

Together with next prime (86976817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52272900 + 34703881 = 7230^2 + 5891^2 .

It is a cyclic number.

It is not a de Polignac number, because 86976781 - 2⁵ = 86976749 is a prime.

It is a super-2 number, since 2×86976781² = 15129920866243922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86976881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43488390 + 43488391.

It is an arithmetic number, because the mean of its divisors is an integer number (43488391).

Almost surely, 2^86976781 is an apocalyptic number.

It is an amenable number.

86976781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86976781 is an equidigital number, since it uses as much as digits as its factorization.

86976781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 52.

The square root of 86976781 is about 9326.1343009845. The cubic root of 86976781 is about 443.0653393154.

The spelling of 86976781 in words is "eighty-six million, nine hundred seventy-six thousand, seven hundred eighty-one".