86217919 has 2 divisors, whose sum is σ = 86217920. Its totient is φ = 86217918.

The previous prime is 86217889. The next prime is 86217959. The reversal of 86217919 is 91971268.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86217919 is a prime.

It is a super-2 number, since 2×86217919² = 14867059113381122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86217959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43108959 + 43108960.

It is an arithmetic number, because the mean of its divisors is an integer number (43108960).

Almost surely, 2^86217919 is an apocalyptic number.

86217919 is a deficient number, since it is larger than the sum of its proper divisors (1).

86217919 is an equidigital number, since it uses as much as digits as its factorization.

86217919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 43.

The square root of 86217919 is about 9285.3604668855. The cubic root of 86217919 is about 441.7730095104.

It can be divided in two parts, 862 and 17919, that added together give a palindrome (18781).

The spelling of 86217919 in words is "eighty-six million, two hundred seventeen thousand, nine hundred nineteen".