85865509 has 8 divisors (see below), whose sum is σ = 90607680. Its totient is φ = 81207456.

The previous prime is 85865501. The next prime is 85865531. The reversal of 85865509 is 90556858.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 85865509 - 2³ = 85865501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85865501) 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, 18927 + ... + 23020.

It is an arithmetic number, because the mean of its divisors is an integer number (11325960).

Almost surely, 2^85865509 is an apocalyptic number.

85865509 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

85865509 is a deficient number, since it is larger than the sum of its proper divisors (4742171).

85865509 is a wasteful number, since it uses less digits than its factorization.

85865509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42059.

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

The square root of 85865509 is about 9266.3643895543. The cubic root of 85865509 is about 441.1702816446.

The spelling of 85865509 in words is "eighty-five million, eight hundred sixty-five thousand, five hundred nine".