86721571 has 8 divisors (see below), whose sum is σ = 90586080. Its totient is φ = 82915392.

The previous prime is 86721499. The next prime is 86721577. The reversal of 86721571 is 17512768.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 86721571 - 2¹⁹ = 86197283 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 86721571.

It is not an unprimeable number, because it can be changed into a prime (86721577) 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 7 ways as a sum of consecutive naturals, for example, 11530 + ... + 17503.

It is an arithmetic number, because the mean of its divisors is an integer number (11323260).

Almost surely, 2^86721571 is an apocalyptic number.

86721571 is a deficient number, since it is larger than the sum of its proper divisors (3864509).

86721571 is a wasteful number, since it uses less digits than its factorization.

86721571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29165.

The product of its digits is 23520, while the sum is 37.

The square root of 86721571 is about 9312.4417313613. The cubic root of 86721571 is about 442.6315626976.

The spelling of 86721571 in words is "eighty-six million, seven hundred twenty-one thousand, five hundred seventy-one".