85441789 has 2 divisors, whose sum is σ = 85441790. Its totient is φ = 85441788.

The previous prime is 85441787. The next prime is 85441793. The reversal of 85441789 is 98714458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85414564 + 27225 = 9242^2 + 165^2 .

It is a cyclic number.

It is not a de Polignac number, because 85441789 - 2¹ = 85441787 is a prime.

It is a super-4 number, since 4×85441789⁴ (a number of 33 digits) contains 4444 as substring.

Together with 85441787, it forms a pair of twin primes.

It is equal to p_4967947 and since 85441789 and 4967947 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85441787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42720894 + 42720895.

It is an arithmetic number, because the mean of its divisors is an integer number (42720895).

Almost surely, 2^85441789 is an apocalyptic number.

It is an amenable number.

85441789 is a deficient number, since it is larger than the sum of its proper divisors (1).

85441789 is an equidigital number, since it uses as much as digits as its factorization.

85441789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 46.

The square root of 85441789 is about 9243.4727781284. The cubic root of 85441789 is about 440.4434045984.

The spelling of 85441789 in words is "eighty-five million, four hundred forty-one thousand, seven hundred eighty-nine".