86510909 has 4 divisors (see below), whose sum is σ = 91599804. Its totient is φ = 81422016.

The previous prime is 86510903. The next prime is 86510911. The reversal of 86510909 is 90901568.

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 34987225 + 51523684 = 5915^2 + 7178^2 .

It is a cyclic number.

It is not a de Polignac number, because 86510909 - 2¹² = 86506813 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 (86510903) 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, 2544422 + ... + 2544455.

It is an arithmetic number, because the mean of its divisors is an integer number (22899951).

Almost surely, 2^86510909 is an apocalyptic number.

It is an amenable number.

86510909 is a deficient number, since it is larger than the sum of its proper divisors (5088895).

86510909 is a wasteful number, since it uses less digits than its factorization.

86510909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5088894.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 86510909 is about 9301.1240718528. The cubic root of 86510909 is about 442.2728620321.

The spelling of 86510909 in words is "eighty-six million, five hundred ten thousand, nine hundred nine".