86040781 has 2 divisors, whose sum is σ = 86040782. Its totient is φ = 86040780.

The previous prime is 86040763. The next prime is 86040803. The reversal of 86040781 is 18704068.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48525156 + 37515625 = 6966^2 + 6125^2 .

It is a cyclic number.

It is not a de Polignac number, because 86040781 - 2²⁵ = 52486349 is a prime.

It is a super-2 number, since 2×86040781² = 14806031990179922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86040701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43020390 + 43020391.

It is an arithmetic number, because the mean of its divisors is an integer number (43020391).

Almost surely, 2^86040781 is an apocalyptic number.

It is an amenable number.

86040781 is a deficient number, since it is larger than the sum of its proper divisors (1).

86040781 is an equidigital number, since it uses as much as digits as its factorization.

86040781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 86040781 is about 9275.8169990573. The cubic root of 86040781 is about 441.4702555817.

The spelling of 86040781 in words is "eighty-six million, forty thousand, seven hundred eighty-one".