86012721 has 6 divisors (see below), whose sum is σ = 124240610. Its totient is φ = 57341808.

The previous prime is 86012687. The next prime is 86012743. The reversal of 86012721 is 12721068.

It can be written as a sum of positive squares in only one way, i.e., 82901025 + 3111696 = 9105^2 + 1764^2 .

It is a de Polignac number, because none of the positive numbers 2^k-86012721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86012821) 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 5 ways as a sum of consecutive naturals, for example, 4778476 + ... + 4778493.

Almost surely, 2^86012721 is an apocalyptic number.

It is an amenable number.

86012721 is a deficient number, since it is larger than the sum of its proper divisors (38227889).

86012721 is a wasteful number, since it uses less digits than its factorization.

86012721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556975 (or 9556972 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 86012721 is about 9274.3043404883. The cubic root of 86012721 is about 441.4222589530.

Adding to 86012721 its reverse (12721068), we get a palindrome (98733789).

The spelling of 86012721 in words is "eighty-six million, twelve thousand, seven hundred twenty-one".