86289209 has 4 divisors (see below), whose sum is σ = 86435316. Its totient is φ = 86143104.

The previous prime is 86289193. The next prime is 86289221. The reversal of 86289209 is 90298268.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47886400 + 38402809 = 6920^2 + 6197^2 .

It is a cyclic number.

It is not a de Polignac number, because 86289209 - 2⁴ = 86289193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86289209.

It is not an unprimeable number, because it can be changed into a prime (86289289) 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 in 3 ways as a sum of consecutive naturals, for example, 72164 + ... + 73349.

It is an arithmetic number, because the mean of its divisors is an integer number (21608829).

Almost surely, 2^86289209 is an apocalyptic number.

It is an amenable number.

86289209 is a deficient number, since it is larger than the sum of its proper divisors (146107).

86289209 is a wasteful number, since it uses less digits than its factorization.

86289209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146106.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 86289209 is about 9289.1985122507. The cubic root of 86289209 is about 441.8947371893.

The spelling of 86289209 in words is "eighty-six million, two hundred eighty-nine thousand, two hundred nine".