86842521 has 18 divisors (see below), whose sum is σ = 132393690. Its totient is φ = 54845856.

The previous prime is 86842517. The next prime is 86842523. The reversal of 86842521 is 12524868.

It can be written as a sum of positive squares in only one way, i.e., 78057225 + 8785296 = 8835^2 + 2964^2 .

It is not a de Polignac number, because 86842521 - 2² = 86842517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86842523) 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 17 ways as a sum of consecutive naturals, for example, 10116 + ... + 16613.

It is an arithmetic number, because the mean of its divisors is an integer number (7355205).

Almost surely, 2^86842521 is an apocalyptic number.

It is an amenable number.

86842521 is a deficient number, since it is larger than the sum of its proper divisors (45551169).

86842521 is a wasteful number, since it uses less digits than its factorization.

86842521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26773 (or 26751 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 86842521 is about 9318.9334690189. The cubic root of 86842521 is about 442.8372455408.

The spelling of 86842521 in words is "eighty-six million, eight hundred forty-two thousand, five hundred twenty-one".