83205561 has 8 divisors (see below), whose sum is σ = 111582720. Its totient is φ = 55149392.

The previous prime is 83205509. The next prime is 83205583. The reversal of 83205561 is 16550238.

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 83205561 - 2¹³ = 83197369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83205061) 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 7 ways as a sum of consecutive naturals, for example, 79641 + ... + 80678.

It is an arithmetic number, because the mean of its divisors is an integer number (13947840).

Almost surely, 2^83205561 is an apocalyptic number.

It is an amenable number.

83205561 is a deficient number, since it is larger than the sum of its proper divisors (28377159).

83205561 is a wasteful number, since it uses less digits than its factorization.

83205561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160495.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 83205561 is about 9121.7082281774. The cubic root of 83205561 is about 436.5668793472.

Adding to 83205561 its reverse (16550238), we get a palindrome (99755799).

The spelling of 83205561 in words is "eighty-three million, two hundred five thousand, five hundred sixty-one".