74543309 has 2 divisors, whose sum is σ = 74543310. Its totient is φ = 74543308.

The previous prime is 74543267. The next prime is 74543341. The reversal of 74543309 is 90334547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47472100 + 27071209 = 6890^2 + 5203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74543309 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 (74549309) 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, 37271654 + 37271655.

It is an arithmetic number, because the mean of its divisors is an integer number (37271655).

Almost surely, 2^74543309 is an apocalyptic number.

It is an amenable number.

74543309 is a deficient number, since it is larger than the sum of its proper divisors (1).

74543309 is an equidigital number, since it uses as much as digits as its factorization.

74543309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 74543309 is about 8633.8467093179. The cubic root of 74543309 is about 420.8586157757.

The spelling of 74543309 in words is "seventy-four million, five hundred forty-three thousand, three hundred nine".