86555209 has 8 divisors (see below), whose sum is σ = 93767240. Its totient is φ = 79895088.

The previous prime is 86555197. The next prime is 86555219. The reversal of 86555209 is 90255568.

It can be written as a sum of positive squares in 4 ways, for example, as 17665209 + 68890000 = 4203^2 + 8300^2 .

It is not a de Polignac number, because 86555209 - 2¹⁷ = 86424137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86555219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17502 + ... + 21895.

It is an arithmetic number, because the mean of its divisors is an integer number (11720905).

Almost surely, 2^86555209 is an apocalyptic number.

It is an amenable number.

86555209 is a deficient number, since it is larger than the sum of its proper divisors (7212031).

86555209 is an equidigital number, since it uses as much as digits as its factorization.

86555209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39436 (or 39410 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 86555209 is about 9303.5051996546. The cubic root of 86555209 is about 442.3483413162.

The spelling of 86555209 in words is "eighty-six million, five hundred fifty-five thousand, two hundred nine".