86021909 has 4 divisors (see below), whose sum is σ = 89762016. Its totient is φ = 82281804.

The previous prime is 86021893. The next prime is 86021939. The reversal of 86021909 is 90912068.

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 86021909 - 2⁴ = 86021893 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 (86021939) 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 3 ways as a sum of consecutive naturals, for example, 1870019 + ... + 1870064.

It is an arithmetic number, because the mean of its divisors is an integer number (22440504).

Almost surely, 2^86021909 is an apocalyptic number.

It is an amenable number.

86021909 is a deficient number, since it is larger than the sum of its proper divisors (3740107).

86021909 is a wasteful number, since it uses less digits than its factorization.

86021909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740106.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 86021909 is about 9274.7996743865. The cubic root of 86021909 is about 441.4379761759.

The spelling of 86021909 in words is "eighty-six million, twenty-one thousand, nine hundred nine".