85789721 has 2 divisors, whose sum is σ = 85789722. Its totient is φ = 85789720.

The previous prime is 85789699. The next prime is 85789763. The reversal of 85789721 is 12798758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74304400 + 11485321 = 8620^2 + 3389^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85789721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85749721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42894860 + 42894861.

It is an arithmetic number, because the mean of its divisors is an integer number (42894861).

Almost surely, 2^85789721 is an apocalyptic number.

It is an amenable number.

85789721 is a deficient number, since it is larger than the sum of its proper divisors (1).

85789721 is an equidigital number, since it uses as much as digits as its factorization.

85789721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The square root of 85789721 is about 9262.2740728182. The cubic root of 85789721 is about 441.0404458288.

The spelling of 85789721 in words is "eighty-five million, seven hundred eighty-nine thousand, seven hundred twenty-one".