85911689 has 2 divisors, whose sum is σ = 85911690. Its totient is φ = 85911688.

The previous prime is 85911671. The next prime is 85911701. The reversal of 85911689 is 98611958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44089600 + 41822089 = 6640^2 + 6467^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85911689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85911289) 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, 42955844 + 42955845.

It is an arithmetic number, because the mean of its divisors is an integer number (42955845).

Almost surely, 2^85911689 is an apocalyptic number.

It is an amenable number.

85911689 is a deficient number, since it is larger than the sum of its proper divisors (1).

85911689 is an equidigital number, since it uses as much as digits as its factorization.

85911689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 47.

The square root of 85911689 is about 9268.8558625108. The cubic root of 85911689 is about 441.2493572151.

The spelling of 85911689 in words is "eighty-five million, nine hundred eleven thousand, six hundred eighty-nine".