83507321 has 2 divisors, whose sum is σ = 83507322. Its totient is φ = 83507320.

The previous prime is 83507311. The next prime is 83507323. The reversal of 83507321 is 12370538.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 11868025 = 8464^2 + 3445^2 .

It is a cyclic number.

It is not a de Polignac number, because 83507321 - 2⁶ = 83507257 is a prime.

It is a Sophie Germain prime.

Together with 83507323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (83507323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41753660 + 41753661.

It is an arithmetic number, because the mean of its divisors is an integer number (41753661).

Almost surely, 2^83507321 is an apocalyptic number.

It is an amenable number.

83507321 is a deficient number, since it is larger than the sum of its proper divisors (1).

83507321 is an equidigital number, since it uses as much as digits as its factorization.

83507321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 83507321 is about 9138.2340197655. The cubic root of 83507321 is about 437.0940055084.

Adding to 83507321 its reverse (12370538), we get a palindrome (95877859).

The spelling of 83507321 in words is "eighty-three million, five hundred seven thousand, three hundred twenty-one".