83805149 has 2 divisors, whose sum is σ = 83805150. Its totient is φ = 83805148.

The previous prime is 83805131. The next prime is 83805221. The reversal of 83805149 is 94150838.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75568249 + 8236900 = 8693^2 + 2870^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83805149 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83805049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41902574 + 41902575.

It is an arithmetic number, because the mean of its divisors is an integer number (41902575).

Almost surely, 2^83805149 is an apocalyptic number.

It is an amenable number.

83805149 is a deficient number, since it is larger than the sum of its proper divisors (1).

83805149 is an equidigital number, since it uses as much as digits as its factorization.

83805149 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 83805149 is about 9154.5152247402. The cubic root of 83805149 is about 437.6130193998.

The spelling of 83805149 in words is "eighty-three million, eight hundred five thousand, one hundred forty-nine".