86661859 has 2 divisors, whose sum is σ = 86661860. Its totient is φ = 86661858.

The previous prime is 86661851. The next prime is 86661863. The reversal of 86661859 is 95816668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 86661859 - 2³ = 86661851 is a prime.

It is not a weakly prime, because it can be changed into another prime (86661851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43330929 + 43330930.

It is an arithmetic number, because the mean of its divisors is an integer number (43330930).

Almost surely, 2^86661859 is an apocalyptic number.

86661859 is a deficient number, since it is larger than the sum of its proper divisors (1).

86661859 is an equidigital number, since it uses as much as digits as its factorization.

86661859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 49.

The square root of 86661859 is about 9309.2351458109. The cubic root of 86661859 is about 442.5299482853.

The spelling of 86661859 in words is "eighty-six million, six hundred sixty-one thousand, eight hundred fifty-nine".