85821719 has 2 divisors, whose sum is σ = 85821720. Its totient is φ = 85821718.

The previous prime is 85821709. The next prime is 85821761. The reversal of 85821719 is 91712858.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85821719 is a prime.

It is a super-2 number, since 2×85821719² = 14730734904229922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85821709) 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, 42910859 + 42910860.

It is an arithmetic number, because the mean of its divisors is an integer number (42910860).

Almost surely, 2^85821719 is an apocalyptic number.

85821719 is a deficient number, since it is larger than the sum of its proper divisors (1).

85821719 is an equidigital number, since it uses as much as digits as its factorization.

85821719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 41.

The square root of 85821719 is about 9264.0012413643. The cubic root of 85821719 is about 441.0952723582.

It can be divided in two parts, 8582 and 1719, that added together give a palindrome (10301).

The spelling of 85821719 in words is "eighty-five million, eight hundred twenty-one thousand, seven hundred nineteen".