82985221 has 16 divisors (see below), whose sum is σ = 93155328. Its totient is φ = 73278000.

The previous prime is 82985209. The next prime is 82985237. The reversal of 82985221 is 12258928.

It is a cyclic number.

It is not a de Polignac number, because 82985221 - 2⁹ = 82984709 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82985251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77536 + ... + 78598.

It is an arithmetic number, because the mean of its divisors is an integer number (5822208).

Almost surely, 2^82985221 is an apocalyptic number.

It is an amenable number.

82985221 is a deficient number, since it is larger than the sum of its proper divisors (10170107).

82985221 is a wasteful number, since it uses less digits than its factorization.

82985221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1272.

The product of its digits is 23040, while the sum is 37.

The square root of 82985221 is about 9109.6224400356. The cubic root of 82985221 is about 436.1811752302.

The spelling of 82985221 in words is "eighty-two million, nine hundred eighty-five thousand, two hundred twenty-one".