86015721 has 16 divisors (see below), whose sum is σ = 125350848. Its totient is φ = 52032000.

The previous prime is 86015707. The next prime is 86015723. The reversal of 86015721 is 12751068.

It is not a de Polignac number, because 86015721 - 2⁵ = 86015689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86015723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17665 + ... + 22001.

It is an arithmetic number, because the mean of its divisors is an integer number (7834428).

Almost surely, 2^86015721 is an apocalyptic number.

It is an amenable number.

86015721 is a deficient number, since it is larger than the sum of its proper divisors (39335127).

86015721 is a wasteful number, since it uses less digits than its factorization.

86015721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4952.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 86015721 is about 9274.4660762763. The cubic root of 86015721 is about 441.4273909512.

Adding to 86015721 its reverse (12751068), we get a palindrome (98766789).

It can be divided in two parts, 86015 and 721, that added together give a triangular number (86736 = T₄₁₆).

The spelling of 86015721 in words is "eighty-six million, fifteen thousand, seven hundred twenty-one".