86530621 has 4 divisors (see below), whose sum is σ = 87030972. Its totient is φ = 86030272.

The previous prime is 86530607. The next prime is 86530637. The reversal of 86530621 is 12603568.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49491225 + 37039396 = 7035^2 + 6086^2 .

It is a cyclic number.

It is not a de Polignac number, because 86530621 - 2⁹ = 86530109 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86530651) 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, 249916 + ... + 250261.

It is an arithmetic number, because the mean of its divisors is an integer number (21757743).

It is a Poulet number, since it divides 2^86530620-1.

Almost surely, 2^86530621 is an apocalyptic number.

It is an amenable number.

86530621 is a deficient number, since it is larger than the sum of its proper divisors (500351).

86530621 is a wasteful number, since it uses less digits than its factorization.

86530621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500350.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 86530621 is about 9302.1836683652. The cubic root of 86530621 is about 442.3064509389.

The spelling of 86530621 in words is "eighty-six million, five hundred thirty thousand, six hundred twenty-one".