83390509 has 2 divisors, whose sum is σ = 83390510. Its totient is φ = 83390508.

The previous prime is 83390473. The next prime is 83390513. The reversal of 83390509 is 90509338.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77616100 + 5774409 = 8810^2 + 2403^2 .

It is a cyclic number.

It is not a de Polignac number, because 83390509 - 2⁷ = 83390381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83390809) 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, 41695254 + 41695255.

It is an arithmetic number, because the mean of its divisors is an integer number (41695255).

Almost surely, 2^83390509 is an apocalyptic number.

It is an amenable number.

83390509 is a deficient number, since it is larger than the sum of its proper divisors (1).

83390509 is an equidigital number, since it uses as much as digits as its factorization.

83390509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 83390509 is about 9131.8403950135. The cubic root of 83390509 is about 436.8901046215.

The spelling of 83390509 in words is "eighty-three million, three hundred ninety thousand, five hundred nine".