85619221 has 8 divisors (see below), whose sum is σ = 89594424. Its totient is φ = 81731520.

The previous prime is 85619197. The next prime is 85619227. The reversal of 85619221 is 12291658.

It can be written as a sum of positive squares in 4 ways, for example, as 57380625 + 28238596 = 7575^2 + 5314^2 .

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

It is not a de Polignac number, because 85619221 - 2⁵ = 85619189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85619227) 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, 19870 + ... + 23791.

It is an arithmetic number, because the mean of its divisors is an integer number (11199303).

Almost surely, 2^85619221 is an apocalyptic number.

It is an amenable number.

85619221 is a deficient number, since it is larger than the sum of its proper divisors (3975203).

85619221 is a wasteful number, since it uses less digits than its factorization.

85619221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43751.

The product of its digits is 8640, while the sum is 34.

The square root of 85619221 is about 9253.0654920410. The cubic root of 85619221 is about 440.7480748764.

The spelling of 85619221 in words is "eighty-five million, six hundred nineteen thousand, two hundred twenty-one".