73224409 has 2 divisors, whose sum is σ = 73224410. Its totient is φ = 73224408.

The previous prime is 73224407. The next prime is 73224413. The reversal of 73224409 is 90442237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61968384 + 11256025 = 7872^2 + 3355^2 .

It is an emirp because it is prime and its reverse (90442237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73224409 - 2¹ = 73224407 is a prime.

Together with 73224407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (73224407) 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, 36612204 + 36612205.

It is an arithmetic number, because the mean of its divisors is an integer number (36612205).

Almost surely, 2^73224409 is an apocalyptic number.

It is an amenable number.

73224409 is a deficient number, since it is larger than the sum of its proper divisors (1).

73224409 is an equidigital number, since it uses as much as digits as its factorization.

73224409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 73224409 is about 8557.1262115269. The cubic root of 73224409 is about 418.3617378673.

The spelling of 73224409 in words is "seventy-three million, two hundred twenty-four thousand, four hundred nine".