86564321 has 2 divisors, whose sum is σ = 86564322. Its totient is φ = 86564320.

The previous prime is 86564299. The next prime is 86564327. The reversal of 86564321 is 12346568.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77176225 + 9388096 = 8785^2 + 3064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86564321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (86564327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43282160 + 43282161.

It is an arithmetic number, because the mean of its divisors is an integer number (43282161).

Almost surely, 2^86564321 is an apocalyptic number.

It is an amenable number.

86564321 is a deficient number, since it is larger than the sum of its proper divisors (1).

86564321 is an equidigital number, since it uses as much as digits as its factorization.

86564321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 86564321 is about 9303.9948946676. The cubic root of 86564321 is about 442.3638633423.

The spelling of 86564321 in words is "eighty-six million, five hundred sixty-four thousand, three hundred twenty-one".