86216569 has 2 divisors, whose sum is σ = 86216570. Its totient is φ = 86216568.

The previous prime is 86216567. The next prime is 86216579. The reversal of 86216569 is 96561268.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68475625 + 17740944 = 8275^2 + 4212^2 .

It is a cyclic number.

It is not a de Polignac number, because 86216569 - 2¹ = 86216567 is a prime.

It is a super-2 number, since 2×86216569² = 14866593540263522, which contains 22 as substring.

Together with 86216567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (86216567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43108284 + 43108285.

It is an arithmetic number, because the mean of its divisors is an integer number (43108285).

Almost surely, 2^86216569 is an apocalyptic number.

It is an amenable number.

86216569 is a deficient number, since it is larger than the sum of its proper divisors (1).

86216569 is an equidigital number, since it uses as much as digits as its factorization.

86216569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 86216569 is about 9285.2877715233. The cubic root of 86216569 is about 441.7707037381.

The spelling of 86216569 in words is "eighty-six million, two hundred sixteen thousand, five hundred sixty-nine".