73965209 has 2 divisors, whose sum is σ = 73965210. Its totient is φ = 73965208.

The previous prime is 73965197. The next prime is 73965211. The reversal of 73965209 is 90256937.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53290000 + 20675209 = 7300^2 + 4547^2 .

It is an emirp because it is prime and its reverse (90256937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73965209 - 2¹⁶ = 73899673 is a prime.

Together with 73965211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73965259) 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, 36982604 + 36982605.

It is an arithmetic number, because the mean of its divisors is an integer number (36982605).

Almost surely, 2^73965209 is an apocalyptic number.

It is an amenable number.

73965209 is a deficient number, since it is larger than the sum of its proper divisors (1).

73965209 is an equidigital number, since it uses as much as digits as its factorization.

73965209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 73965209 is about 8600.3028435050. The cubic root of 73965209 is about 419.7678403267.

The spelling of 73965209 in words is "seventy-three million, nine hundred sixty-five thousand, two hundred nine".