82554221 has 4 divisors (see below), whose sum is σ = 86899200. Its totient is φ = 78209244.

The previous prime is 82554203. The next prime is 82554223. The reversal of 82554221 is 12245528.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-82554221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82554223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2172461 + ... + 2172498.

It is an arithmetic number, because the mean of its divisors is an integer number (21724800).

Almost surely, 2^82554221 is an apocalyptic number.

It is an amenable number.

82554221 is a deficient number, since it is larger than the sum of its proper divisors (4344979).

82554221 is a wasteful number, since it uses less digits than its factorization.

82554221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344978.

The product of its digits is 6400, while the sum is 29.

The square root of 82554221 is about 9085.9353398536. The cubic root of 82554221 is about 435.4247333482.

Adding to 82554221 its reverse (12245528), we get a palindrome (94799749).

The spelling of 82554221 in words is "eighty-two million, five hundred fifty-four thousand, two hundred twenty-one".