82572221 has 4 divisors (see below), whose sum is σ = 83344032. Its totient is φ = 81800412.

The previous prime is 82572199. The next prime is 82572227. The reversal of 82572221 is 12227528.

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 cyclic number.

It is not a de Polignac number, because 82572221 - 2²² = 78377917 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 (82572227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385745 + ... + 385958.

It is an arithmetic number, because the mean of its divisors is an integer number (20836008).

Almost surely, 2^82572221 is an apocalyptic number.

It is an amenable number.

82572221 is a deficient number, since it is larger than the sum of its proper divisors (771811).

82572221 is a wasteful number, since it uses less digits than its factorization.

82572221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771810.

The product of its digits is 4480, while the sum is 29.

The square root of 82572221 is about 9086.9258278034. The cubic root of 82572221 is about 435.4563775030.

Adding to 82572221 its reverse (12227528), we get a palindrome (94799749).

The spelling of 82572221 in words is "eighty-two million, five hundred seventy-two thousand, two hundred twenty-one".