85667221 has 6 divisors (see below), whose sum is σ = 86444930. Its totient is φ = 84896448.

The previous prime is 85667209. The next prime is 85667243. The reversal of 85667221 is 12276658.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2656900 + 83010321 = 1630^2 + 9111^2 .

It is not a de Polignac number, because 85667221 - 2²⁵ = 52112789 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 (85667201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9415 + ... + 16123.

Almost surely, 2^85667221 is an apocalyptic number.

It is an amenable number.

85667221 is a deficient number, since it is larger than the sum of its proper divisors (777709).

85667221 is an equidigital number, since it uses as much as digits as its factorization.

85667221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6935 (or 6822 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 85667221 is about 9255.6588636358. The cubic root of 85667221 is about 440.8304238127.

The spelling of 85667221 in words is "eighty-five million, six hundred sixty-seven thousand, two hundred twenty-one".