86509609 has 4 divisors (see below), whose sum is σ = 87141204. Its totient is φ = 85878016.

The previous prime is 86509573. The next prime is 86509613. The reversal of 86509609 is 90690568.

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 70509609 + 16000000 = 8397^2 + 4000^2 .

It is a cyclic number.

It is not a de Polignac number, because 86509609 - 2⁹ = 86509097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86509699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315592 + ... + 315865.

It is an arithmetic number, because the mean of its divisors is an integer number (21785301).

Almost surely, 2^86509609 is an apocalyptic number.

It is an amenable number.

86509609 is a deficient number, since it is larger than the sum of its proper divisors (631595).

86509609 is a wasteful number, since it uses less digits than its factorization.

86509609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631594.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 86509609 is about 9301.0541875639. The cubic root of 86509609 is about 442.2706466752.

The spelling of 86509609 in words is "eighty-six million, five hundred nine thousand, six hundred nine".