86117821 has 4 divisors (see below), whose sum is σ = 87208000. Its totient is φ = 85027644.

The previous prime is 86117807. The next prime is 86117839. The reversal of 86117821 is 12871168.

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 86117821 - 2⁷ = 86117693 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 (86117851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544971 + ... + 545128.

It is an arithmetic number, because the mean of its divisors is an integer number (21802000).

Almost surely, 2^86117821 is an apocalyptic number.

It is an amenable number.

86117821 is a deficient number, since it is larger than the sum of its proper divisors (1090179).

86117821 is a wasteful number, since it uses less digits than its factorization.

86117821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090178.

The product of its digits is 5376, while the sum is 34.

The square root of 86117821 is about 9279.9688038269. The cubic root of 86117821 is about 441.6019788652.

Adding to 86117821 its reverse (12871168), we get a palindrome (98988989).

The spelling of 86117821 in words is "eighty-six million, one hundred seventeen thousand, eight hundred twenty-one".