7540973309 has 2 divisors, whose sum is σ = 7540973310. Its totient is φ = 7540973308.

The previous prime is 7540973303. The next prime is 7540973333. The reversal of 7540973309 is 9033790457.

It is a happy number.

7540973309 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5456776900 + 2084196409 = 73870^2 + 45653^2 .

It is an emirp because it is prime and its reverse (9033790457) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7540973309 - 2⁸ = 7540973053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7540973303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3770486654 + 3770486655.

It is an arithmetic number, because the mean of its divisors is an integer number (3770486655).

Almost surely, 2^7540973309 is an apocalyptic number.

It is an amenable number.

7540973309 is a deficient number, since it is larger than the sum of its proper divisors (1).

7540973309 is an equidigital number, since it uses as much as digits as its factorization.

7540973309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 714420, while the sum is 47.

The square root of 7540973309 is about 86838.7776802507. Note that the first 3 decimals coincide. The cubic root of 7540973309 is about 1960.9919063949.

The spelling of 7540973309 in words is "seven billion, five hundred forty million, nine hundred seventy-three thousand, three hundred nine".