86821019 has 2 divisors, whose sum is σ = 86821020. Its totient is φ = 86821018.

The previous prime is 86820991. The next prime is 86821027. The reversal of 86821019 is 91012868.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86821019 is a prime.

It is a super-2 number, since 2×86821019² = 15075778680396722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 86821019.

It is not a weakly prime, because it can be changed into another prime (86821039) 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, 43410509 + 43410510.

It is an arithmetic number, because the mean of its divisors is an integer number (43410510).

Almost surely, 2^86821019 is an apocalyptic number.

86821019 is a deficient number, since it is larger than the sum of its proper divisors (1).

86821019 is an equidigital number, since it uses as much as digits as its factorization.

86821019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 86821019 is about 9317.7797248057. The cubic root of 86821019 is about 442.8006940438.

The spelling of 86821019 in words is "eighty-six million, eight hundred twenty-one thousand, nineteen".