85618221 has 8 divisors (see below), whose sum is σ = 122939040. Its totient is φ = 52688112.

The previous prime is 85618217. The next prime is 85618229. The reversal of 85618221 is 12281658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85618221 - 2² = 85618217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85618229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097631 + ... + 1097708.

It is an arithmetic number, because the mean of its divisors is an integer number (15367380).

Almost surely, 2^85618221 is an apocalyptic number.

It is an amenable number.

85618221 is a deficient number, since it is larger than the sum of its proper divisors (37320819).

85618221 is a wasteful number, since it uses less digits than its factorization.

85618221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195355.

The product of its digits is 7680, while the sum is 33.

The square root of 85618221 is about 9253.0114557370. The cubic root of 85618221 is about 440.7463589463.

Adding to 85618221 its reverse (12281658), we get a palindrome (97899879).

The spelling of 85618221 in words is "eighty-five million, six hundred eighteen thousand, two hundred twenty-one".