83008561 has 2 divisors, whose sum is σ = 83008562. Its totient is φ = 83008560.

The previous prime is 83008553. The next prime is 83008571. The reversal of 83008561 is 16580038.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59582961 + 23425600 = 7719^2 + 4840^2 .

It is a cyclic number.

It is not a de Polignac number, because 83008561 - 2³ = 83008553 is a prime.

It is not a weakly prime, because it can be changed into another prime (83008531) 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 as a sum of consecutive naturals, namely, 41504280 + 41504281.

It is an arithmetic number, because the mean of its divisors is an integer number (41504281).

Almost surely, 2^83008561 is an apocalyptic number.

It is an amenable number.

83008561 is a deficient number, since it is larger than the sum of its proper divisors (1).

83008561 is an equidigital number, since it uses as much as digits as its factorization.

83008561 is an odious number, because the sum of its binary digits is odd.

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

The square root of 83008561 is about 9110.9034129443. The cubic root of 83008561 is about 436.2220640945. Note that the first 3 decimals are identical.

Adding to 83008561 its reverse (16580038), we get a palindrome (99588599).

It can be divided in two parts, 8300 and 8561, that added together give a palindrome (16861).

The spelling of 83008561 in words is "eighty-three million, eight thousand, five hundred sixty-one".