86640121 has 2 divisors, whose sum is σ = 86640122. Its totient is φ = 86640120.

The previous prime is 86640091. The next prime is 86640137. The reversal of 86640121 is 12104668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85285225 + 1354896 = 9235^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 86640121 - 2¹¹ = 86638073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86640121.

It is not a weakly prime, because it can be changed into another prime (86640161) 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 as a sum of consecutive naturals, namely, 43320060 + 43320061.

It is an arithmetic number, because the mean of its divisors is an integer number (43320061).

Almost surely, 2^86640121 is an apocalyptic number.

It is an amenable number.

86640121 is a deficient number, since it is larger than the sum of its proper divisors (1).

86640121 is an equidigital number, since it uses as much as digits as its factorization.

86640121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 86640121 is about 9308.0675223163. The cubic root of 86640121 is about 442.4929442309.

Adding to 86640121 its reverse (12104668), we get a palindrome (98744789).

The spelling of 86640121 in words is "eighty-six million, six hundred forty thousand, one hundred twenty-one".