86555809 has 2 divisors, whose sum is σ = 86555810. Its totient is φ = 86555808.

The previous prime is 86555753. The next prime is 86555867. The reversal of 86555809 is 90855568.

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., 86545809 + 10000 = 9303^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 86555809 - 2⁷ = 86555681 is a prime.

It is not a weakly prime, because it can be changed into another prime (86555009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43277904 + 43277905.

It is an arithmetic number, because the mean of its divisors is an integer number (43277905).

Almost surely, 2^86555809 is an apocalyptic number.

It is an amenable number.

86555809 is a deficient number, since it is larger than the sum of its proper divisors (1).

86555809 is an equidigital number, since it uses as much as digits as its factorization.

86555809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 46.

The square root of 86555809 is about 9303.5374455096. The cubic root of 86555809 is about 442.3493634322.

The spelling of 86555809 in words is "eighty-six million, five hundred fifty-five thousand, eight hundred nine".