83220061 has 4 divisors (see below), whose sum is σ = 84044124. Its totient is φ = 82396000.

The previous prime is 83220047. The next prime is 83220079. The reversal of 83220061 is 16002238.

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 63904036 + 19316025 = 7994^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 83220061 - 2⁵ = 83220029 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 (83220001) 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, 411880 + ... + 412081.

It is an arithmetic number, because the mean of its divisors is an integer number (21011031).

Almost surely, 2^83220061 is an apocalyptic number.

It is an amenable number.

83220061 is a deficient number, since it is larger than the sum of its proper divisors (824063).

83220061 is a wasteful number, since it uses less digits than its factorization.

83220061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824062.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 83220061 is about 9122.5030008216. The cubic root of 83220061 is about 436.5922376365.

Adding to 83220061 its reverse (16002238), we get a palindrome (99222299).

The spelling of 83220061 in words is "eighty-three million, two hundred twenty thousand, sixty-one".