75742309 has 2 divisors, whose sum is σ = 75742310. Its totient is φ = 75742308.

The previous prime is 75742291. The next prime is 75742313. The reversal of 75742309 is 90324757.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75742209 + 100 = 8703^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 75742309 - 2⁹ = 75741797 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 (75742319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37871154 + 37871155.

It is an arithmetic number, because the mean of its divisors is an integer number (37871155).

Almost surely, 2^75742309 is an apocalyptic number.

It is an amenable number.

75742309 is a deficient number, since it is larger than the sum of its proper divisors (1).

75742309 is an equidigital number, since it uses as much as digits as its factorization.

75742309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 37.

The square root of 75742309 is about 8703.0057451435. The cubic root of 75742309 is about 423.1030735038.

The spelling of 75742309 in words is "seventy-five million, seven hundred forty-two thousand, three hundred nine".