86491709 has 4 divisors (see below), whose sum is σ = 86530560. Its totient is φ = 86452860.

The previous prime is 86491693. The next prime is 86491711. The reversal of 86491709 is 90719468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86491709 - 2⁴ = 86491693 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 86491709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86491729) 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, 15869 + ... + 20610.

It is an arithmetic number, because the mean of its divisors is an integer number (21632640).

Almost surely, 2^86491709 is an apocalyptic number.

It is an amenable number.

86491709 is a deficient number, since it is larger than the sum of its proper divisors (38851).

86491709 is a wasteful number, since it uses less digits than its factorization.

86491709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38850.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 86491709 is about 9300.0918812666. The cubic root of 86491709 is about 442.2401406588.

The spelling of 86491709 in words is "eighty-six million, four hundred ninety-one thousand, seven hundred nine".