85518229 has 4 divisors (see below), whose sum is σ = 85538700. Its totient is φ = 85497760.

The previous prime is 85518217. The next prime is 85518247. The reversal of 85518229 is 92281558.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8254129 + 77264100 = 2873^2 + 8790^2 .

It is a cyclic number.

It is not a de Polignac number, because 85518229 - 2¹³ = 85510037 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 85518191 and 85518200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85518289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1462 + ... + 13159.

It is an arithmetic number, because the mean of its divisors is an integer number (21384675).

Almost surely, 2^85518229 is an apocalyptic number.

85518229 is the 5849-th heptagonal number.

It is an amenable number.

85518229 is a deficient number, since it is larger than the sum of its proper divisors (20471).

85518229 is a wasteful number, since it uses less digits than its factorization.

85518229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20470.

The product of its digits is 57600, while the sum is 40.

The square root of 85518229 is about 9247.6066633481. The cubic root of 85518229 is about 440.5747121591.

The spelling of 85518229 in words is "eighty-five million, five hundred eighteen thousand, two hundred twenty-nine".