83957609 has 2 divisors, whose sum is σ = 83957610. Its totient is φ = 83957608.

The previous prime is 83957597. The next prime is 83957617. The reversal of 83957609 is 90675938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 27331984 = 7525^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 83957609 - 2²⁰ = 82909033 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83957689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41978804 + 41978805.

It is an arithmetic number, because the mean of its divisors is an integer number (41978805).

Almost surely, 2^83957609 is an apocalyptic number.

It is an amenable number.

83957609 is a deficient number, since it is larger than the sum of its proper divisors (1).

83957609 is an equidigital number, since it uses as much as digits as its factorization.

83957609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 83957609 is about 9162.8384794233. The cubic root of 83957609 is about 437.8782300861.

The spelling of 83957609 in words is "eighty-three million, nine hundred fifty-seven thousand, six hundred nine".