73943609 has 2 divisors, whose sum is σ = 73943610. Its totient is φ = 73943608.

The previous prime is 73943593. The next prime is 73943627. The reversal of 73943609 is 90634937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63361600 + 10582009 = 7960^2 + 3253^2 .

It is an emirp because it is prime and its reverse (90634937) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73943609 - 2⁴ = 73943593 is a prime.

It is not a weakly prime, because it can be changed into another prime (73943699) 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, 36971804 + 36971805.

It is an arithmetic number, because the mean of its divisors is an integer number (36971805).

Almost surely, 2^73943609 is an apocalyptic number.

It is an amenable number.

73943609 is a deficient number, since it is larger than the sum of its proper divisors (1).

73943609 is an equidigital number, since it uses as much as digits as its factorization.

73943609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 73943609 is about 8599.0469820789. The cubic root of 73943609 is about 419.7269748611.

The spelling of 73943609 in words is "seventy-three million, nine hundred forty-three thousand, six hundred nine".