83659909 has 2 divisors, whose sum is σ = 83659910. Its totient is φ = 83659908.

The previous prime is 83659871. The next prime is 83659943. The reversal of 83659909 is 90995638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77827684 + 5832225 = 8822^2 + 2415^2 .

It is a cyclic number.

It is not a de Polignac number, because 83659909 - 2²¹ = 81562757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83650909) 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, 41829954 + 41829955.

It is an arithmetic number, because the mean of its divisors is an integer number (41829955).

Almost surely, 2^83659909 is an apocalyptic number.

It is an amenable number.

83659909 is a deficient number, since it is larger than the sum of its proper divisors (1).

83659909 is an equidigital number, since it uses as much as digits as its factorization.

83659909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 83659909 is about 9146.5790872872. The cubic root of 83659909 is about 437.3600688815.

The spelling of 83659909 in words is "eighty-three million, six hundred fifty-nine thousand, nine hundred nine".