85449581 has 6 divisors (see below), whose sum is σ = 99400590. Its totient is φ = 73242456.

The previous prime is 85449527. The next prime is 85449587. The reversal of 85449581 is 18594458.

It can be written as a sum of positive squares in only one way, i.e., 69973225 + 15476356 = 8365^2 + 3934^2 .

It is not a de Polignac number, because 85449581 - 2¹⁰ = 85448557 is a prime.

It is a super-2 number, since 2×85449581² = 14603261786151122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85449587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 871886 + ... + 871983.

It is an arithmetic number, because the mean of its divisors is an integer number (16566765).

Almost surely, 2^85449581 is an apocalyptic number.

It is an amenable number.

85449581 is a deficient number, since it is larger than the sum of its proper divisors (13951009).

85449581 is a wasteful number, since it uses less digits than its factorization.

85449581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1743883 (or 1743876 counting only the distinct ones).

The product of its digits is 230400, while the sum is 44.

The square root of 85449581 is about 9243.8942551286. The cubic root of 85449581 is about 440.4567931706.

The spelling of 85449581 in words is "eighty-five million, four hundred forty-nine thousand, five hundred eighty-one".