85218609 has 8 divisors (see below), whose sum is σ = 129856960. Its totient is φ = 48696336.

The previous prime is 85218607. The next prime is 85218631. The reversal of 85218609 is 90681258.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85218609 - 2¹ = 85218607 is a prime.

It is a super-2 number, since 2×85218609² = 14524422639789762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85218607) 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 in 7 ways as a sum of consecutive naturals, for example, 2028994 + ... + 2029035.

It is an arithmetic number, because the mean of its divisors is an integer number (16232120).

Almost surely, 2^85218609 is an apocalyptic number.

It is an amenable number.

85218609 is a deficient number, since it is larger than the sum of its proper divisors (44638351).

85218609 is a wasteful number, since it uses less digits than its factorization.

85218609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4058039.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 85218609 is about 9231.3925818373. The cubic root of 85218609 is about 440.0595804305.

The spelling of 85218609 in words is "eighty-five million, two hundred eighteen thousand, six hundred nine".