82215229 has 4 divisors (see below), whose sum is σ = 82367740. Its totient is φ = 82062720.

The previous prime is 82215227. The next prime is 82215233. The reversal of 82215229 is 92251228.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50552100 + 31663129 = 7110^2 + 5627^2 .

It is a cyclic number.

It is not a de Polignac number, because 82215229 - 2¹ = 82215227 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82215229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82215227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75444 + ... + 76525.

It is an arithmetic number, because the mean of its divisors is an integer number (20591935).

Almost surely, 2^82215229 is an apocalyptic number.

It is an amenable number.

82215229 is a deficient number, since it is larger than the sum of its proper divisors (152511).

82215229 is a wasteful number, since it uses less digits than its factorization.

82215229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152510.

The product of its digits is 5760, while the sum is 31.

The square root of 82215229 is about 9067.2613836814. The cubic root of 82215229 is about 434.8279215445.

The spelling of 82215229 in words is "eighty-two million, two hundred fifteen thousand, two hundred twenty-nine".