82220561 has 8 divisors (see below), whose sum is σ = 86049600. Its totient is φ = 78412752.

The previous prime is 82220519. The next prime is 82220563. The reversal of 82220561 is 16502228.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 82220561 - 2¹⁸ = 81958417 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 82220561.

It is not an unprimeable number, because it can be changed into a prime (82220563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2906 + ... + 13148.

It is an arithmetic number, because the mean of its divisors is an integer number (10756200).

Almost surely, 2^82220561 is an apocalyptic number.

It is an amenable number.

82220561 is a deficient number, since it is larger than the sum of its proper divisors (3829039).

82220561 is a wasteful number, since it uses less digits than its factorization.

82220561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 82220561 is about 9067.5554037458. Note that the first 3 decimals coincide. The cubic root of 82220561 is about 434.8373214751.

Adding to 82220561 its reverse (16502228), we get a palindrome (98722789).

The spelling of 82220561 in words is "eighty-two million, two hundred twenty thousand, five hundred sixty-one".